diff --git a/Dockerfile b/Dockerfile
index b7f8db3f2..6d73e6a90 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG ALPINE_VERSION=3.12.0
+ARG ALPINE_VERSION=3.15.0
 FROM alpine:${ALPINE_VERSION}
 
 RUN apk add --no-cache git python3 python3-dev py-pip build-base
@@ -22,7 +22,7 @@ RUN pip3 install hg-evolve --user --no-cache-dir
 
 # install repo2docker
 COPY --from=0 /tmp/wheelhouse /tmp/wheelhouse
-RUN pip3 install --no-cache-dir /tmp/wheelhouse/*.whl --ignore-installed \
+RUN pip3 install --use-deprecated=legacy-resolver --no-cache-dir /tmp/wheelhouse/*.whl --ignore-installed \
  && pip3 list
 
 # add git-credential helper
diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index 7212257f0..a511ca47e 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -3,6 +3,56 @@ Changelog
 =========
 
 
+Version 2022.02.0
+=================
+
+`Full changelog <https://github.com/jupyterhub/repo2docker/compare/2021.08.0...2022.01.0>`_
+
+New features
+------------
+
+- Update ipywidgets jupyter-offlinenotebook jupyterlab :pr:`1127` by :user:`manics`
+- Allow passing in extra args to Docker initialization :pr:`1124` by :user:`yuvipanda`
+- Allow passing in traitlets via commandline :pr:`1123` by :user:`yuvipanda`
+- Bump default R version to 4.1 :pr:`1107` by :user:`yuvipanda`
+- Update jupyterlab 3.2.5 jupyter-resource-usage 0.6.1 :pr:`1105` by :user:`manics`
+- Get binary R packages from packagemanager.rstudio.com :pr:`1104` by :user:`yuvipanda`
+- Support R 4.1 :pr:`1102` by :user:`yuvipanda`
+- Add command line option to pass extra build args :pr:`1100` by :user:`TimoRoth`
+- Set labels when building image from Dockerfile :pr:`1097` by :user:`TimoRoth`
+- jupyterlab 3.1.17 :pr:`1092` by :user:`minrk`
+- Bump JupyterLab to 3.1.11 :pr:`1081` by :user:`choldgraf`
+- Bootstrap base env with micromamba :pr:`1062` by :user:`wolfv ` 
+- Default UI to JupyterLab :pr:`1035` by :user:`SylvainCorlay`
+
+API changes
+-----------
+
+Bug fixes
+---------
+
+Other merged PRs
+----------------
+
+- Put micromamba in /usr/local/bin and use mamba for installs :pr:`1128` by :user:`minrk`
+- Remove deprecated calls to distutils :pr:`1122` by :user:`minrk`
+- Delete /tmp/downloaded_packages after running install.R :pr:`1119` by :user:`yuvipanda`
+- Use a smaller R library in our tests :pr:`1118` by :user:`yuvipanda`
+- Only get R itself (r-base-core) from apt, not CRAN packages :pr:`1117` by :user:`minrk`
+- set USER root after each directive block :pr:`1115` by :user:`minrk`
+- Say 'apt repository' rather than PPA :pr:`1111` by :user:`yuvipanda`
+- add tests for R conda :pr:`1108` by :user:`aplamada`
+- Add help message to freeze.py :pr:`1106` by :user:`manics`
+- Quieter R builds :pr:`1103` by :user:`yuvipanda`
+- update user_interface doc to reflect that lab is default :pr:`1085` by :user:`minrk`
+- Updates to dev docs + Recommonmark -> MyST Parser :pr:`1082` by :user:`choldgraf`
+- Fix Docker build (again) :pr:`1078` by :user:`manics`
+- [mrg] __init__.py: r_version: fixed description :pr:`1074` by :user:`magnush0lm`
+- Typo fix in utils docstring :pr:`1072` by :user:`jgarte`
+- Rename requirements.py-3.5.txt to requirements.py-3.5.pip :pr:`1061` by :user:`manics`
+- Remove nodesource' nodejs :pr:`847` by :user:`yuvipanda`
+
+
 Version 2021.08.0
 =================
 
diff --git a/repo2docker/__main__.py b/repo2docker/__main__.py
index 1dd49ebe9..5dd139ec8 100644
--- a/repo2docker/__main__.py
+++ b/repo2docker/__main__.py
@@ -66,6 +66,20 @@ def get_argparser():
         description="Fetch a repository and build a container image"
     )
 
+    argparser.add_argument(
+        "--help-all",
+        dest="help_all",
+        action="store_true",
+        help="Display all configurable options and exit.",
+    )
+
+    argparser.add_argument(
+        "--version",
+        dest="version",
+        action="store_true",
+        help="Print the repo2docker version and exit.",
+    )
+
     argparser.add_argument(
         "--config",
         default="repo2docker_config.py",
@@ -204,15 +218,24 @@ def get_argparser():
 
     argparser.add_argument("--appendix", type=str, help=Repo2Docker.appendix.help)
 
-    argparser.add_argument("--subdir", type=str, help=Repo2Docker.subdir.help)
+    argparser.add_argument(
+        "--label",
+        dest="labels",
+        action="append",
+        help="Extra label to set on the image, in form name=value",
+        default=[],
+    )
 
     argparser.add_argument(
-        "--version",
-        dest="version",
-        action="store_true",
-        help="Print the repo2docker version and exit.",
+        "--build-arg",
+        dest="build_args",
+        action="append",
+        help="Extra build arg to pass to the build process, in form name=value",
+        default=[],
     )
 
+    argparser.add_argument("--subdir", type=str, help=Repo2Docker.subdir.help)
+
     argparser.add_argument(
         "--cache-from", action="append", default=[], help=Repo2Docker.cache_from.help
     )
@@ -229,15 +252,24 @@ def make_r2d(argv=None):
     if argv is None:
         argv = sys.argv[1:]
 
+    argparser = get_argparser()
+
     # version must be checked before parse, as repo/cmd are required and
     # will spit out an error if allowed to be parsed first.
     if "--version" in argv:
         print(__version__)
         sys.exit(0)
 
-    args = get_argparser().parse_args(argv)
+    if "--help-all" in argv:
+        argparser.print_help()
+        print("\nAll configurable options:\n")
+        Repo2Docker().print_help(classes=True)
+        sys.exit(0)
+
+    args, traitlet_args = argparser.parse_known_args(argv)
 
     r2d = Repo2Docker()
+    r2d.parse_command_line(traitlet_args)
 
     if args.debug:
         r2d.log_level = logging.DEBUG
@@ -246,6 +278,14 @@ def make_r2d(argv=None):
     if args.appendix:
         r2d.appendix = args.appendix
 
+    for l in args.labels:
+        key, _, val = l.partition("=")
+        r2d.labels[key] = val
+
+    for a in args.build_args:
+        key, _, val = a.partition("=")
+        r2d.extra_build_args[key] = val
+
     r2d.repo = args.repo
     r2d.ref = args.ref
 
diff --git a/repo2docker/app.py b/repo2docker/app.py
index 12f346d94..480d98055 100755
--- a/repo2docker/app.py
+++ b/repo2docker/app.py
@@ -47,6 +47,10 @@ class Repo2Docker(Application):
     name = "jupyter-repo2docker"
     version = __version__
     description = __doc__
+    # disable aliases/flags because we don't use the traitlets for CLI parsing
+    # other than --Class.trait=value
+    aliases = {}
+    flags = {}
 
     @default("log_level")
     def _default_log_level(self):
@@ -239,6 +243,26 @@ def _user_name_default(self):
         """,
     )
 
+    labels = Dict(
+        {},
+        help="""
+        Extra labels to set on the final image.
+
+        Each Label is a key-value pair, with the key being the name of the label
+        and the value its value.
+        """,
+        config=True,
+    )
+
+    extra_build_args = Dict(
+        {},
+        help="""
+        Extra build args to pass to the image build process.
+        This is pretty much only useful for custom Dockerfile based builds.
+        """,
+        config=True,
+    )
+
     json_logs = Bool(
         False,
         help="""
@@ -472,7 +496,7 @@ def json_excepthook(self, etype, evalue, traceback):
             extra=dict(phase="failed"),
         )
 
-    def initialize(self):
+    def initialize(self, *args, **kwargs):
         """Init repo2docker configuration before start"""
         # FIXME: Remove this function, move it to setters / traitlet reactors
         if self.json_logs:
@@ -749,23 +773,28 @@ def build(self):
                 picked_buildpack.labels["repo2docker.repo"] = repo_label
                 picked_buildpack.labels["repo2docker.ref"] = self.ref
 
+                picked_buildpack.labels.update(self.labels)
+
+                build_args = {
+                    "NB_USER": self.user_name,
+                    "NB_UID": str(self.user_id),
+                }
+                if self.target_repo_dir:
+                    build_args["REPO_DIR"] = self.target_repo_dir
+                build_args.update(self.extra_build_args)
+
                 if self.dry_run:
-                    print(picked_buildpack.render())
+                    print(picked_buildpack.render(build_args))
                 else:
                     self.log.debug(
-                        picked_buildpack.render(), extra=dict(phase="building")
+                        picked_buildpack.render(build_args),
+                        extra=dict(phase="building"),
                     )
                     if self.user_id == 0:
                         raise ValueError(
                             "Root as the primary user in the image is not permitted."
                         )
 
-                    build_args = {
-                        "NB_USER": self.user_name,
-                        "NB_UID": str(self.user_id),
-                    }
-                    if self.target_repo_dir:
-                        build_args["REPO_DIR"] = self.target_repo_dir
                     self.log.info(
                         "Using %s builder\n",
                         bp.__class__.__name__,
diff --git a/repo2docker/buildpacks/_r_base.py b/repo2docker/buildpacks/_r_base.py
index a9892a01b..5e14f3c91 100644
--- a/repo2docker/buildpacks/_r_base.py
+++ b/repo2docker/buildpacks/_r_base.py
@@ -3,66 +3,67 @@
 
 Keeping this in r.py would lead to cyclic imports.
 """
+from ..semver import parse_version as V
 
-# Via https://rstudio.com/products/rstudio/download-server/debian-ubuntu/
-RSTUDIO_URL = "https://download2.rstudio.org/server/bionic/amd64/rstudio-server-1.2.5001-amd64.deb"
-# This is MD5, because that is what RStudio download page provides!
-RSTUDIO_CHECKSUM = "d33881b9ab786c09556c410e7dc477de"
 
-# Via https://www.rstudio.com/products/shiny/download-server/
-SHINY_URL = "https://download3.rstudio.org/ubuntu-14.04/x86_64/shiny-server-1.5.12.933-amd64.deb"
-SHINY_CHECKSUM = "9aeef6613e7f58f21c97a4600921340e"
-
-# Version of MRAN to pull devtools from.
-DEVTOOLS_VERSION = "2018-02-01"
+def rstudio_base_scripts(r_version):
+    """Base steps to install RStudio and shiny-server."""
 
-# IRKernel version - specified as a tag in the IRKernel repository
-IRKERNEL_VERSION = "1.1"
+    # Shiny server (not the package!) seems to be the same version for all R versions
+    shiny_server_url = "https://download3.rstudio.org/ubuntu-14.04/x86_64/shiny-server-1.5.17.973-amd64.deb"
+    shiny_proxy_version = "1.1"
+    shiny_sha256sum = "80f1e48f6c824be7ef9c843bb7911d4981ac7e8a963e0eff823936a8b28476ee"
 
+    if V(r_version) <= V("4.1"):
+        # Older RStudio and jupyter-rsession-proxy for v4.1 and below
+        rstudio_url = "https://download2.rstudio.org/server/bionic/amd64/rstudio-server-1.3.959-amd64.deb"
+        rstudio_sha256sum = (
+            "187af05cab1221282487fdc33f4b161484c3228eaade3d6697b1d41c206ee6d9"
+        )
+        rsession_proxy_version = "1.4"
+    else:
+        rstudio_url = "https://download2.rstudio.org/server/bionic/amd64/rstudio-server-2021.09.1-372-amd64.deb"
+        rstudio_sha256sum = (
+            "c58df09468870b89f1796445853dce2dacaa0fc5b7bb1f92b036fa8da1d1f8a3"
+        )
+        rsession_proxy_version = "2.0.1"
 
-def rstudio_base_scripts():
-    """Base steps to install RStudio and shiny-server."""
     return [
         (
             "root",
-            # Install RStudio!
+            # we should have --no-install-recommends on all our apt-get install commands,
+            # but here it's important because these recommend r-base,
+            # which will upgrade the installed version of R, undoing our pinned version
             r"""
-                curl --silent --location --fail {rstudio_url} > /tmp/rstudio.deb && \
-                echo '{rstudio_checksum} /tmp/rstudio.deb' | md5sum -c - && \
-                apt-get update && \
-                apt install -y /tmp/rstudio.deb && \
-                rm /tmp/rstudio.deb && \
-                apt-get -qq purge && \
-                apt-get -qq clean && \
-                rm -rf /var/lib/apt/lists/*
-                """.format(
-                rstudio_url=RSTUDIO_URL, rstudio_checksum=RSTUDIO_CHECKSUM
+            curl --silent --location --fail {rstudio_url} > /tmp/rstudio.deb && \
+            curl --silent --location --fail {shiny_server_url} > /tmp/shiny.deb && \
+            echo '{rstudio_sha256sum} /tmp/rstudio.deb' | sha256sum -c - && \
+            echo '{shiny_sha256sum} /tmp/shiny.deb' | sha256sum -c - && \
+            apt-get update > /dev/null && \
+            apt install -y --no-install-recommends /tmp/rstudio.deb /tmp/shiny.deb && \
+            rm /tmp/rstudio.deb && \
+            apt-get -qq purge && \
+            apt-get -qq clean && \
+            rm -rf /var/lib/apt/lists/*
+            """.format(
+                rstudio_url=rstudio_url,
+                rstudio_sha256sum=rstudio_sha256sum,
+                shiny_server_url=shiny_server_url,
+                shiny_sha256sum=shiny_sha256sum,
             ),
         ),
         (
-            "root",
-            # Install Shiny Server!
+            "${NB_USER}",
+            # Install jupyter-rsession-proxy
             r"""
-                curl --silent --location --fail {url} > {deb} && \
-                echo '{checksum} {deb}' | md5sum -c - && \
-                dpkg -i {deb} && \
-                rm {deb}
+                pip install --no-cache \
+                    jupyter-rsession-proxy=={rsession_proxy_version} \
+                    jupyter-shiny-proxy=={shiny_proxy_version}
                 """.format(
-                url=SHINY_URL, checksum=SHINY_CHECKSUM, deb="/tmp/shiny.deb"
+                rsession_proxy_version=rsession_proxy_version,
+                shiny_proxy_version=shiny_proxy_version,
             ),
         ),
-        (
-            "${NB_USER}",
-            # Install nbrsessionproxy
-            r"""
-                pip install --no-cache-dir jupyter-server-proxy==1.4.0 && \
-                pip install --no-cache-dir https://github.com/jupyterhub/jupyter-rsession-proxy/archive/d5efed5455870556fc414f30871d0feca675a4b4.zip && \
-                pip install --no-cache-dir https://github.com/ryanlovett/jupyter-shiny-proxy/archive/47557dc47e2aeeab490eb5f3eeae414cdde4a6a9.zip && \
-                jupyter serverextension enable jupyter_server_proxy --sys-prefix && \
-                jupyter nbextension install --py jupyter_server_proxy --sys-prefix && \
-                jupyter nbextension enable --py jupyter_server_proxy --sys-prefix
-                """,
-        ),
         (
             # Not all of these locations are configurable; so we make sure
             # they exist and have the correct permissions
diff --git a/repo2docker/buildpacks/base.py b/repo2docker/buildpacks/base.py
index e7c2b22d8..65fb821fe 100644
--- a/repo2docker/buildpacks/base.py
+++ b/repo2docker/buildpacks/base.py
@@ -52,11 +52,6 @@
         --uid ${NB_UID} \
         ${NB_USER}
 
-RUN wget --quiet -O - https://deb.nodesource.com/gpgkey/nodesource.gpg.key |  apt-key add - && \
-    DISTRO="bionic" && \
-    echo "deb https://deb.nodesource.com/node_14.x $DISTRO main" >> /etc/apt/sources.list.d/nodesource.list && \
-    echo "deb-src https://deb.nodesource.com/node_14.x $DISTRO main" >> /etc/apt/sources.list.d/nodesource.list
-
 # Base package installs are not super interesting to users, so hide their outputs
 # If install fails for some reason, errors will still be printed
 RUN apt-get -qq update && \
@@ -105,6 +100,8 @@
 {% for sd in build_script_directives -%}
 {{ sd }}
 {% endfor %}
+# ensure root user after build scripts
+USER root
 
 # Allow target path repo is cloned to be configurable
 ARG REPO_DIR=${HOME}
@@ -143,6 +140,8 @@
 {% for sd in preassemble_script_directives -%}
 {{ sd }}
 {% endfor %}
+# ensure root user after preassemble scripts
+USER root
 
 # Copy stuff.
 COPY --chown={{ user }}:{{ user }} src/ ${REPO_DIR}
@@ -251,7 +250,6 @@ def get_base_packages(self):
         return {
             # Utils!
             "less",
-            "nodejs",
             "unzip",
         }
 
@@ -635,32 +633,8 @@ def get_build_env(self):
         """Return env directives required for build"""
         return [
             ("APP_BASE", "/srv"),
-            ("NPM_DIR", "${APP_BASE}/npm"),
-            ("NPM_CONFIG_GLOBALCONFIG", "${NPM_DIR}/npmrc"),
         ]
 
-    def get_path(self):
-        return super().get_path() + ["${NPM_DIR}/bin"]
-
-    def get_build_scripts(self):
-        scripts = [
-            (
-                "root",
-                r"""
-                mkdir -p ${NPM_DIR} && \
-                chown -R ${NB_USER}:${NB_USER} ${NPM_DIR}
-                """,
-            ),
-            (
-                "${NB_USER}",
-                r"""
-                npm config --global set prefix ${NPM_DIR}
-                """,
-            ),
-        ]
-
-        return super().get_build_scripts() + scripts
-
     def get_env(self):
         """Return env directives to be set after build"""
         return []
diff --git a/repo2docker/buildpacks/conda/__init__.py b/repo2docker/buildpacks/conda/__init__.py
index 8b88507af..5c37ba186 100644
--- a/repo2docker/buildpacks/conda/__init__.py
+++ b/repo2docker/buildpacks/conda/__init__.py
@@ -6,7 +6,7 @@
 from ruamel.yaml import YAML
 
 from ..base import BaseImage
-from .._r_base import rstudio_base_scripts, IRKERNEL_VERSION
+from .._r_base import rstudio_base_scripts
 from ...utils import is_local_pip_requirement
 
 # pattern for parsing conda dependency line
@@ -51,7 +51,14 @@ def get_build_env(self):
         env = super().get_build_env() + [
             ("CONDA_DIR", "${APP_BASE}/conda"),
             ("NB_PYTHON_PREFIX", "${CONDA_DIR}/envs/notebook"),
+            # We install npm / node from conda-forge
+            ("NPM_DIR", "${APP_BASE}/npm"),
+            ("NPM_CONFIG_GLOBALCONFIG", "${NPM_DIR}/npmrc"),
             ("NB_ENVIRONMENT_FILE", self._nb_environment_file),
+            ("MAMBA_ROOT_PREFIX", "${CONDA_DIR}"),
+            # this exe should be used for installs after bootstrap with micromamba
+            # switch this to /usr/local/bin/micromamba to use it for all installs
+            ("MAMBA_EXE", "${CONDA_DIR}/bin/mamba"),
         ]
         if self._nb_requirements_file:
             env.append(("NB_REQUIREMENTS_FILE", self._nb_requirements_file))
@@ -85,6 +92,8 @@ def get_path(self):
         if self.py2:
             path.insert(0, "${KERNEL_PYTHON_PREFIX}/bin")
         path.insert(0, "${NB_PYTHON_PREFIX}/bin")
+        # This is at the end of $PATH, for backwards compat reasons
+        path.append("${NPM_DIR}/bin")
         return path
 
     def get_build_scripts(self):
@@ -93,7 +102,7 @@ def get_build_scripts(self):
 
         All scripts here should be independent of contents of the repository.
 
-        This sets up through `install-miniforge.bash` (found in this directory):
+        This sets up through `install-base-env.bash` (found in this directory):
 
         - a directory for the conda environment and its ownership by the
           notebook user
@@ -110,10 +119,17 @@ def get_build_scripts(self):
                 "root",
                 r"""
                 TIMEFORMAT='time: %3R' \
-                bash -c 'time /tmp/install-miniforge.bash' && \
-                rm -rf /tmp/install-miniforge.bash /tmp/env
+                bash -c 'time /tmp/install-base-env.bash' && \
+                rm -rf /tmp/install-base-env.bash /tmp/env
                 """,
-            )
+            ),
+            (
+                "root",
+                r"""
+                mkdir -p ${NPM_DIR} && \
+                chown -R ${NB_USER}:${NB_USER} ${NPM_DIR}
+                """,
+            ),
         ]
 
     major_pythons = {"2": "2.7", "3": "3.7"}
@@ -134,7 +150,7 @@ def get_build_script_files(self):
 
         """
         files = {
-            "conda/install-miniforge.bash": "/tmp/install-miniforge.bash",
+            "conda/install-base-env.bash": "/tmp/install-base-env.bash",
             "conda/activate-conda.sh": "/etc/profile.d/activate-conda.sh",
         }
         py_version = self.python_version
@@ -320,14 +336,16 @@ def get_env_scripts(self):
         environment_yml = self.binder_path("environment.yml")
         env_prefix = "${KERNEL_PYTHON_PREFIX}" if self.py2 else "${NB_PYTHON_PREFIX}"
         if os.path.exists(environment_yml):
+            # TODO: when using micromamba, we call $MAMBA_EXE install -p ...
+            # whereas mamba/conda need `env update -p ...` when it's an env.yaml file
             scripts.append(
                 (
                     "${NB_USER}",
                     r"""
                 TIMEFORMAT='time: %3R' \
-                bash -c 'time mamba env update -p {0} -f "{1}" && \
-                time mamba clean --all -f -y && \
-                mamba list -p {0} \
+                bash -c 'time ${{MAMBA_EXE}} env update -p {0} --file "{1}" && \
+                time ${{MAMBA_EXE}} clean --all -f -y && \
+                ${{MAMBA_EXE}} list -p {0} \
                 '
                 """.format(
                         env_prefix, environment_yml
@@ -344,15 +362,15 @@ def get_env_scripts(self):
                 (
                     "${NB_USER}",
                     r"""
-                mamba install -p {0} r-base{1} r-irkernel={2} r-devtools -y && \
-                mamba clean --all -f -y && \
-                mamba list -p {0}
+                ${{MAMBA_EXE}} install -p {0} r-base{1} r-irkernel=1.2 r-devtools -y && \
+                ${{MAMBA_EXE}} clean --all -f -y && \
+                ${{MAMBA_EXE}} list -p {0}
                 """.format(
-                        env_prefix, r_pin, IRKERNEL_VERSION
+                        env_prefix, r_pin
                     ),
                 )
             )
-            scripts += rstudio_base_scripts()
+            scripts += rstudio_base_scripts(self.r_version)
             scripts += [
                 (
                     "root",
diff --git a/repo2docker/buildpacks/conda/activate-conda.sh b/repo2docker/buildpacks/conda/activate-conda.sh
index 2af21a11e..48372318e 100755
--- a/repo2docker/buildpacks/conda/activate-conda.sh
+++ b/repo2docker/buildpacks/conda/activate-conda.sh
@@ -1,11 +1,14 @@
 # enable conda and activate the notebook environment
-CONDA_PROFILE="${CONDA_DIR}/etc/profile.d/conda.sh"
-test -f $CONDA_PROFILE && . $CONDA_PROFILE
+eval $(micromamba shell hook -s posix -p ${CONDA_DIR})
+for name in conda mamba; do
+    CONDA_PROFILE="${CONDA_DIR}/etc/profile.d/${name}.sh"
+    test -f $CONDA_PROFILE && . $CONDA_PROFILE
+done
 if [[ "${KERNEL_PYTHON_PREFIX}" != "${NB_PYTHON_PREFIX}" ]]; then
     # if the kernel is a separate env, stack them
     # so both are on PATH, notebook first
-    conda activate ${KERNEL_PYTHON_PREFIX}
-    conda activate --stack ${NB_PYTHON_PREFIX}
+    mamba activate ${KERNEL_PYTHON_PREFIX}
+    mamba activate --stack ${NB_PYTHON_PREFIX}
 
     # even though it's second on $PATH
     # make sure CONDA_DEFAULT_ENV is the *kernel* env
@@ -14,5 +17,5 @@ if [[ "${KERNEL_PYTHON_PREFIX}" != "${NB_PYTHON_PREFIX}" ]]; then
     # which only contains UI when the two are different
     export CONDA_DEFAULT_ENV="${KERNEL_PYTHON_PREFIX}"
 else
-    conda activate ${NB_PYTHON_PREFIX}
+    mamba activate ${NB_PYTHON_PREFIX}
 fi
diff --git a/repo2docker/buildpacks/conda/environment.lock b/repo2docker/buildpacks/conda/environment.lock
index b697f6441..13528f204 100644
--- a/repo2docker/buildpacks/conda/environment.lock
+++ b/repo2docker/buildpacks/conda/environment.lock
@@ -1,23 +1,26 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:33:42 UTC
+# Frozen on 2022-01-26 18:35:40 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: e916b3483f9a6a858e8e836b294a35ef667c4f7b74b486b5d22621b93a0b9cbb
+# input_hash: 8daa45fe7e84c647f0c5ab04c1199514abe3834c110cffac7bd4a18cc5375472
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.10.8-ha878542_0.tar.bz2#575611b8a84f45960e87722eeb51fa26
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+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-11.2.0-he4da1e4_12.tar.bz2#7ff3b832ba5e6918c0d026976359d065
+https://conda.anaconda.org/conda-forge/linux-64/pandoc-2.17.0.1-h7f98852_0.tar.bz2#bd9fa82641da6dfe5696fd196e3c7cf1
+https://conda.anaconda.org/conda-forge/linux-64/libgomp-11.2.0-h1d223b6_12.tar.bz2#763c5ec8116d984b4a33342236d7da36
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-https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.2-h7f98852_0.tar.bz2#a25871010e5104556045aa01850fbddf
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-11.2.0-h1d223b6_12.tar.bz2#d34efbb8d7d6312c816b4bb647b818b1
+https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.18.1-h7f98852_0.tar.bz2#f26ef8098fab1f719c91eb760d63381a
+https://conda.anaconda.org/conda-forge/linux-64/icu-69.1-h9c3ff4c_0.tar.bz2#e0773c9556d588b062a4e1424a6a02fa
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-https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h9c3ff4c_4.tar.bz2#dea515312db9d4788e52c2edfc657635
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2#d645c6d2ac96843a2bfaccd2d62b3ac3
+https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.0-h7f98852_0.tar.bz2#39b1328babf85c7c3a61636d9cd50206
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+https://conda.anaconda.org/conda-forge/linux-64/libuv-1.43.0-h7f98852_0.tar.bz2#b34d856aa7e06ebd79bded72ef4afc16
 https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.2.11-h36c2ea0_1013.tar.bz2#dcddf696ff5dfcab567100d691678e18
-https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h9c3ff4c_0.tar.bz2#fb31bcb7af058244479ca635d20f0f4a
 https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1l-h7f98852_0.tar.bz2#de7b38a1542dbe6f41653a8ae71adc53
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@@ -26,89 +29,89 @@ https://conda.anaconda.org/conda-forge/linux-64/zeromq-4.3.4-h9c3ff4c_1.tar.bz2#
 https://conda.anaconda.org/conda-forge/linux-64/zlib-1.2.11-h36c2ea0_1013.tar.bz2#cf7190238072a41e9579e4476a6a60b8
 https://conda.anaconda.org/conda-forge/linux-64/libnghttp2-1.43.0-h812cca2_1.tar.bz2#d0a7846b7b3b8fb0d8b36904a53b8155
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-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.36.0-h9cd32fc_2.tar.bz2#3588c2c6cb9f9bcc65b544ab1c715d60
+https://conda.anaconda.org/conda-forge/linux-64/nodejs-14.18.3-h8ca31f7_2.tar.bz2#192a478a1ae899992e4afce84520badb
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.37.0-h9cd32fc_0.tar.bz2#eb66fc098824d25518a79e83d12a81d6
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-https://conda.anaconda.org/conda-forge/linux-64/krb5-1.19.2-hcc1bbae_2.tar.bz2#2094cf6b08a571cecf7fa332152e6461
-https://conda.anaconda.org/conda-forge/linux-64/python-3.7.10-hb7a2778_102_cpython.tar.bz2#67ddb126f309b101e57da5cfe8741959
+https://conda.anaconda.org/conda-forge/linux-64/krb5-1.19.2-hcc1bbae_3.tar.bz2#e29650992ae593bc05fc93722483e5c3
+https://conda.anaconda.org/conda-forge/linux-64/python-3.7.12-hb7a2778_100_cpython.tar.bz2#2d94b3e6a9fdaf83f6955d008c8011a7
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-https://conda.anaconda.org/conda-forge/noarch/attrs-21.2.0-pyhd8ed1ab_0.tar.bz2#d2e1c7f388ac403df7079b411c37cc50
+https://conda.anaconda.org/conda-forge/noarch/attrs-21.4.0-pyhd8ed1ab_0.tar.bz2#f70280205d7044c8b8358c8de3190e5d
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-https://conda.anaconda.org/conda-forge/noarch/idna-3.1-pyhd3deb0d_0.tar.bz2#9c9aea4b8391264477df484f798562d0
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+https://conda.anaconda.org/conda-forge/noarch/nest-asyncio-1.5.4-pyhd8ed1ab_0.tar.bz2#0d86e4e6ac78912f3f47e0453b124aca
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diff --git a/repo2docker/buildpacks/conda/environment.py-2.7.lock b/repo2docker/buildpacks/conda/environment.py-2.7.lock
index 433a32fae..58dd42c09 100644
--- a/repo2docker/buildpacks/conda/environment.py-2.7.lock
+++ b/repo2docker/buildpacks/conda/environment.py-2.7.lock
@@ -1,43 +1,43 @@
 # AUTO GENERATED FROM environment.py-2.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:32:48 UTC
+# Frozen on 2022-01-26 18:33:44 UTC
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-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.36.0-h9cd32fc_2.tar.bz2#3588c2c6cb9f9bcc65b544ab1c715d60
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-https://conda.anaconda.org/conda-forge/linux-64/backports_abc-0.5-py27_0.tar.bz2#125cc4f050a230395060f1f1349ec18e
+https://conda.anaconda.org/conda-forge/noarch/backports-1.0-py_2.tar.bz2#0da16b293affa6ac31812376f8eb79dd
+https://conda.anaconda.org/conda-forge/noarch/backports_abc-0.5-py_1.tar.bz2#6ac8cc52b55791b066dc43469bbaf8f2
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-https://conda.anaconda.org/conda-forge/linux-64/simplegeneric-0.8.1-py27_0.tar.bz2#f1db3b1ec8ca72f3b1a26331b386aa51
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-https://conda.anaconda.org/conda-forge/noarch/wheel-0.37.0-pyhd8ed1ab_1.tar.bz2#3aa2c3e25dd361b453d010388b9cdff1
+https://conda.anaconda.org/conda-forge/noarch/wheel-0.37.1-pyhd8ed1ab_0.tar.bz2#1ca02aaf78d9c70d9a81a3bed5752022
+https://conda.anaconda.org/conda-forge/noarch/backports.shutil_get_terminal_size-1.0.0-py_3.tar.bz2#ed3c4ce59b457c5fd7ca79b94c57eff4
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 https://conda.anaconda.org/conda-forge/linux-64/futures-3.3.0-py27h8c360ce_1.tar.bz2#2689f3fc54d3987298828719b0244005
-https://conda.anaconda.org/conda-forge/linux-64/pexpect-4.8.0-py27h8c360ce_1.tar.bz2#e772596cb72ea97421227a22aefba64a
+https://conda.anaconda.org/conda-forge/noarch/pexpect-4.8.0-pyh9f0ad1d_2.tar.bz2#5909e7b978141dd80d28dbf9de627827
 https://conda.anaconda.org/conda-forge/noarch/python-dateutil-2.8.1-py_0.tar.bz2#0d0150ed9c2d25817f5324108d3f7571
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 https://conda.anaconda.org/conda-forge/linux-64/scandir-1.10.0-py27hdf8410d_1.tar.bz2#bfaf4b51772c5904b696ce7d68731397
@@ -52,6 +52,6 @@ https://conda.anaconda.org/conda-forge/linux-64/pickleshare-0.7.5-py27h8c360ce_1
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-https://conda.anaconda.org/conda-forge/linux-64/prompt_toolkit-1.0.15-py27_0.tar.bz2#e64d8ff5a16afcea0dff046bc837f6db
+https://conda.anaconda.org/conda-forge/noarch/prompt_toolkit-1.0.15-py_1.tar.bz2#f5bea0930b268df84653cb32c8d1542f
 https://conda.anaconda.org/conda-forge/linux-64/ipython-5.8.0-py27_1.tar.bz2#b95b11ff25dde76c6fa0c5620a8e90ad
 https://conda.anaconda.org/conda-forge/linux-64/ipykernel-4.8.2-py27_0.tar.bz2#18141b1342f87e1607c5b389c2c12a81
diff --git a/repo2docker/buildpacks/conda/environment.py-3.5.lock b/repo2docker/buildpacks/conda/environment.py-3.5.lock
index 252974738..7d4d75059 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.5.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.5.lock
@@ -1,25 +1,31 @@
 # py3.5 conda packages are no longer being updated as of 12/2018
+# note: one update 11/2021 to shift nodejs into conda-env
 # this file is hand-maintained now
 # and should only receive security fixes, no new features
 @EXPLICIT
-https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-main.tar.bz2
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2018.10.15-ha4d7672_0.tar.bz2
-https://repo.anaconda.com/pkgs/main/linux-64/libstdcxx-ng-7.2.0-hdf63c60_3.conda
-https://repo.anaconda.com/pkgs/main/linux-64/libgcc-ng-7.2.0-hdf63c60_3.conda
+https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.10.8-ha878542_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-11.2.0-he4da1e4_11.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/libgomp-11.2.0-h1d223b6_11.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-1_gnu.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-11.2.0-h1d223b6_11.tar.bz2
 https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.6-h470a237_2.tar.bz2
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-https://conda.anaconda.org/conda-forge/linux-64/libffi-3.2.1-hfc679d8_5.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/icu-68.2-h9c3ff4c_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2
 https://conda.anaconda.org/conda-forge/linux-64/libsodium-1.0.16-h470a237_1.tar.bz2
-https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.1-hfc679d8_1.tar.bz2
-https://conda.anaconda.org/conda-forge/linux-64/openssl-1.0.2p-h470a237_1.tar.bz2
-https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.4-h470a237_1.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/libuv-1.42.0-h7f98852_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1l-h7f98852_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.5-h516909a_1.tar.bz2
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+https://conda.anaconda.org/conda-forge/linux-64/nodejs-14.17.4-h92b4a50_0.tar.bz2
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-https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.9-ha92aebf_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/readline-8.1-h46c0cb4_0.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.11-h27826a3_1.tar.bz2
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-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.25.3-hb1c47c0_0.tar.bz2
-https://conda.anaconda.org/conda-forge/linux-64/python-3.5.5-h5001a0f_2.tar.bz2
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.36.0-h9cd32fc_2.tar.bz2
+https://repo.anaconda.com/pkgs/main/linux-64/python-3.5.6-h12debd9_1.conda
 https://conda.anaconda.org/conda-forge/noarch/backcall-0.1.0-py_0.tar.bz2
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.lock b/repo2docker/buildpacks/conda/environment.py-3.6.lock
index 9a5915f95..8537d0477 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.6.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.6.lock
@@ -1,23 +1,26 @@
 # AUTO GENERATED FROM environment.py-3.6.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:33:22 UTC
+# Frozen on 2022-01-26 18:34:43 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 1b892b16944e00001e2e99c86d794fe0e1077e89eb9e3f11632db4cb8157f34b
+# input_hash: a380aced865172581392c0b25b78cfde69a59becdb41fef3ade37eae6b024aed
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.10.8-ha878542_0.tar.bz2#575611b8a84f45960e87722eeb51fa26
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+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-11.2.0-he4da1e4_12.tar.bz2#7ff3b832ba5e6918c0d026976359d065
+https://conda.anaconda.org/conda-forge/linux-64/pandoc-2.17.0.1-h7f98852_0.tar.bz2#bd9fa82641da6dfe5696fd196e3c7cf1
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-https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.2-h7f98852_0.tar.bz2#a25871010e5104556045aa01850fbddf
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-11.2.0-h1d223b6_12.tar.bz2#d34efbb8d7d6312c816b4bb647b818b1
+https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.18.1-h7f98852_0.tar.bz2#f26ef8098fab1f719c91eb760d63381a
+https://conda.anaconda.org/conda-forge/linux-64/icu-69.1-h9c3ff4c_0.tar.bz2#e0773c9556d588b062a4e1424a6a02fa
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-https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h9c3ff4c_4.tar.bz2#dea515312db9d4788e52c2edfc657635
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.4.2-h7f98852_5.tar.bz2#d645c6d2ac96843a2bfaccd2d62b3ac3
+https://conda.anaconda.org/conda-forge/linux-64/libnsl-2.0.0-h7f98852_0.tar.bz2#39b1328babf85c7c3a61636d9cd50206
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+https://conda.anaconda.org/conda-forge/linux-64/libuv-1.43.0-h7f98852_0.tar.bz2#b34d856aa7e06ebd79bded72ef4afc16
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-https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h9c3ff4c_0.tar.bz2#fb31bcb7af058244479ca635d20f0f4a
 https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1l-h7f98852_0.tar.bz2#de7b38a1542dbe6f41653a8ae71adc53
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@@ -26,57 +29,58 @@ https://conda.anaconda.org/conda-forge/linux-64/zeromq-4.3.4-h9c3ff4c_1.tar.bz2#
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-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.36.0-h9cd32fc_2.tar.bz2#3588c2c6cb9f9bcc65b544ab1c715d60
+https://conda.anaconda.org/conda-forge/linux-64/nodejs-14.18.3-h8ca31f7_2.tar.bz2#192a478a1ae899992e4afce84520badb
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.37.0-h9cd32fc_0.tar.bz2#eb66fc098824d25518a79e83d12a81d6
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+https://conda.anaconda.org/conda-forge/linux-64/krb5-1.19.2-hcc1bbae_3.tar.bz2#e29650992ae593bc05fc93722483e5c3
+https://conda.anaconda.org/conda-forge/linux-64/python-3.6.15-hb7a2778_0_cpython.tar.bz2#2263dbd2d8116aa8dd974602faabb1a2
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-https://conda.anaconda.org/conda-forge/noarch/attrs-21.2.0-pyhd8ed1ab_0.tar.bz2#d2e1c7f388ac403df7079b411c37cc50
+https://conda.anaconda.org/conda-forge/noarch/attrs-21.4.0-pyhd8ed1ab_0.tar.bz2#f70280205d7044c8b8358c8de3190e5d
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-https://conda.anaconda.org/conda-forge/linux-64/backports-1.0-py36_1.tar.bz2#0e8774f348e40cdc512fee62fb202f7b
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.6.yml b/repo2docker/buildpacks/conda/environment.py-3.6.yml
index c14f64255..30b8137f8 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.6.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.6.yml
@@ -1,14 +1,16 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2021-10-06 07:32:48 UTC
+# Generated on 2022-01-26 18:33:44 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.6.*
+- nodejs=14
 - pip
-- ipywidgets==7.6.3
-- jupyter-offlinenotebook==0.2.1
-- jupyter-resource-usage==0.6.0
-- jupyterlab==3.1.17
+- ipywidgets==7.6.5
+- jupyter-offlinenotebook==0.2.2
+- jupyter-resource-usage==0.6.1
+- jupyterlab==3.2.8
+  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
 - jupyterhub-singleuser==1.4.2
   # Newer versions require python 3.7
 - nbconvert==6.0.7
diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.lock b/repo2docker/buildpacks/conda/environment.py-3.7.lock
index b697f6441..13528f204 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.lock
@@ -1,23 +1,26 @@
 # AUTO GENERATED FROM environment.py-3.7.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:33:42 UTC
+# Frozen on 2022-01-26 18:35:40 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: e916b3483f9a6a858e8e836b294a35ef667c4f7b74b486b5d22621b93a0b9cbb
+# input_hash: 8daa45fe7e84c647f0c5ab04c1199514abe3834c110cffac7bd4a18cc5375472
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+https://conda.anaconda.org/conda-forge/linux-64/libuv-1.43.0-h7f98852_0.tar.bz2#b34d856aa7e06ebd79bded72ef4afc16
 https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.2.11-h36c2ea0_1013.tar.bz2#dcddf696ff5dfcab567100d691678e18
-https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h9c3ff4c_0.tar.bz2#fb31bcb7af058244479ca635d20f0f4a
 https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1l-h7f98852_0.tar.bz2#de7b38a1542dbe6f41653a8ae71adc53
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@@ -26,89 +29,89 @@ https://conda.anaconda.org/conda-forge/linux-64/zeromq-4.3.4-h9c3ff4c_1.tar.bz2#
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-https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.36.0-h9cd32fc_2.tar.bz2#3588c2c6cb9f9bcc65b544ab1c715d60
+https://conda.anaconda.org/conda-forge/linux-64/nodejs-14.18.3-h8ca31f7_2.tar.bz2#192a478a1ae899992e4afce84520badb
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.37.0-h9cd32fc_0.tar.bz2#eb66fc098824d25518a79e83d12a81d6
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-https://conda.anaconda.org/conda-forge/linux-64/krb5-1.19.2-hcc1bbae_2.tar.bz2#2094cf6b08a571cecf7fa332152e6461
-https://conda.anaconda.org/conda-forge/linux-64/python-3.7.10-hb7a2778_102_cpython.tar.bz2#67ddb126f309b101e57da5cfe8741959
+https://conda.anaconda.org/conda-forge/linux-64/krb5-1.19.2-hcc1bbae_3.tar.bz2#e29650992ae593bc05fc93722483e5c3
+https://conda.anaconda.org/conda-forge/linux-64/python-3.7.12-hb7a2778_100_cpython.tar.bz2#2d94b3e6a9fdaf83f6955d008c8011a7
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diff --git a/repo2docker/buildpacks/conda/environment.py-3.7.yml b/repo2docker/buildpacks/conda/environment.py-3.7.yml
index 8bd2dc816..69bc0ae13 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.7.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.7.yml
@@ -1,14 +1,16 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2021-10-06 07:33:22 UTC
+# Generated on 2022-01-26 18:34:43 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.7.*
+- nodejs=14
 - pip
-- ipywidgets==7.6.3
-- jupyter-offlinenotebook==0.2.1
-- jupyter-resource-usage==0.6.0
-- jupyterlab==3.1.17
+- ipywidgets==7.6.5
+- jupyter-offlinenotebook==0.2.2
+- jupyter-resource-usage==0.6.1
+- jupyterlab==3.2.8
+  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
 - jupyterhub-singleuser==1.4.2
   # Newer versions require python 3.7
 - nbconvert==6.0.7
diff --git a/repo2docker/buildpacks/conda/environment.py-3.8.lock b/repo2docker/buildpacks/conda/environment.py-3.8.lock
index 32d17732e..b3deb7845 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.8.lock
@@ -1,23 +1,26 @@
 # AUTO GENERATED FROM environment.py-3.8.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:34:05 UTC
+# Frozen on 2022-01-26 18:36:36 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 1b7425281a129eb07cc2888bb7bfdd4a31be1be59d16df223bea0e704dc4af4b
+# input_hash: 76e94579a1728608e8c93f5df71d7f564ac6a98a6b3e770fdb3cc24ed7d034c0
 @EXPLICIT
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+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.10.8-ha878542_0.tar.bz2#575611b8a84f45960e87722eeb51fa26
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-https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
+https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.3-h9c3ff4c_0.tar.bz2#fb31bcb7af058244479ca635d20f0f4a
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@@ -26,86 +29,101 @@ https://conda.anaconda.org/conda-forge/linux-64/zeromq-4.3.4-h9c3ff4c_1.tar.bz2#
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+https://conda.anaconda.org/conda-forge/linux-64/nodejs-14.18.3-h8ca31f7_2.tar.bz2#192a478a1ae899992e4afce84520badb
+https://conda.anaconda.org/conda-forge/linux-64/sqlite-3.37.0-h9cd32fc_0.tar.bz2#eb66fc098824d25518a79e83d12a81d6
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+https://conda.anaconda.org/conda-forge/noarch/alembic-1.7.5-pyhd8ed1ab_0.tar.bz2#1102908123392ffc63c01caea136b1d4
+https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-21.3.0-pyhd8ed1ab_0.tar.bz2#a0b402db58f73aaab8ee0ca1025a362e
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@@ -113,23 +131,22 @@ https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.1.1-pyhd8ed1ab_0.tar.bz
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-https://conda.anaconda.org/conda-forge/noarch/nbclient-0.5.4-pyhd8ed1ab_0.tar.bz2#66ea0ea89e4f657a8b85fa5bdfce60ac
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+https://conda.anaconda.org/conda-forge/noarch/ipywidgets-7.6.5-pyhd8ed1ab_0.tar.bz2#6f2ee1ec157104df141e2e5afeba98d4
+https://conda.anaconda.org/conda-forge/noarch/jupyterlab-3.2.8-pyhd8ed1ab_0.tar.bz2#e2cc0671571f14af58f832c912dee025
diff --git a/repo2docker/buildpacks/conda/environment.py-3.8.yml b/repo2docker/buildpacks/conda/environment.py-3.8.yml
index 453971908..aa1b19507 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.8.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.8.yml
@@ -1,14 +1,16 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2021-10-06 07:33:42 UTC
+# Generated on 2022-01-26 18:35:40 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.8.*
+- nodejs=14
 - pip
-- ipywidgets==7.6.3
-- jupyter-offlinenotebook==0.2.1
-- jupyter-resource-usage==0.6.0
-- jupyterlab==3.1.17
+- ipywidgets==7.6.5
+- jupyter-offlinenotebook==0.2.2
+- jupyter-resource-usage==0.6.1
+- jupyterlab==3.2.8
+  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
 - jupyterhub-singleuser==1.4.2
   # Newer versions require python 3.7
 - nbconvert==6.0.7
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9.lock b/repo2docker/buildpacks/conda/environment.py-3.9.lock
index 8d9057f19..aedba8895 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9.lock
+++ b/repo2docker/buildpacks/conda/environment.py-3.9.lock
@@ -1,24 +1,29 @@
 # AUTO GENERATED FROM environment.py-3.9.yml, DO NOT MANUALLY MODIFY
-# Frozen on 2021-10-06 07:34:26 UTC
+# Frozen on 2022-01-26 18:37:30 UTC
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: b5f1d3830efc370610ea8555a709b2d631ec78e2686563f54edd23491be06086
+# input_hash: 26314177814dc09ebdfe9ad8cd35b257ebec964ae6e21918e0bfb7bf38675075
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
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+https://conda.anaconda.org/conda-forge/linux-64/mypy_extensions-0.4.3-py39hf3d152e_4.tar.bz2#1778f314bd13102e3a1627280cb8ac79
+https://conda.anaconda.org/conda-forge/noarch/packaging-21.3-pyhd8ed1ab_0.tar.bz2#71f1ab2de48613876becddd496371c85
 https://conda.anaconda.org/conda-forge/noarch/pexpect-4.8.0-pyh9f0ad1d_2.tar.bz2#5909e7b978141dd80d28dbf9de627827
-https://conda.anaconda.org/conda-forge/linux-64/pickleshare-0.7.5-py39hde42818_1002.tar.bz2#2dc9995512c80256532250a6fd616b14
-https://conda.anaconda.org/conda-forge/linux-64/psutil-5.8.0-py39h3811e60_1.tar.bz2#29cb4c7769cc2a6e86cc13615e9b4a15
-https://conda.anaconda.org/conda-forge/linux-64/pycurl-7.44.1-py39h72e3413_0.tar.bz2#a9d879a1397a4e5bbd79f169f8fa7e29
-https://conda.anaconda.org/conda-forge/linux-64/pyrsistent-0.17.3-py39h3811e60_2.tar.bz2#4ec88cc4b941bc447fd97cadd76e32de
-https://conda.anaconda.org/conda-forge/linux-64/pysocks-1.7.1-py39hf3d152e_3.tar.bz2#f7e7fdc66f2362bebc407f1ab7d10f63
+https://conda.anaconda.org/conda-forge/linux-64/psutil-5.9.0-py39h3811e60_0.tar.bz2#3eebabdf4f0bf1d94a97b67263196868
+https://conda.anaconda.org/conda-forge/linux-64/pycurl-7.44.1-py39h72e3413_1.tar.bz2#f3fa6db2ea8983102beb98d87eb85c0b
+https://conda.anaconda.org/conda-forge/linux-64/pyrsistent-0.18.1-py39h3811e60_0.tar.bz2#ed156d752c577f4e9b62159d5aac8557
+https://conda.anaconda.org/conda-forge/linux-64/pysocks-1.7.1-py39hf3d152e_4.tar.bz2#eed9d381f391cad4e96f697e8c74e929
 https://conda.anaconda.org/conda-forge/noarch/python-dateutil-2.8.2-pyhd8ed1ab_0.tar.bz2#dd999d1cc9f79e67dbb855c8924c7984
-https://conda.anaconda.org/conda-forge/linux-64/pyzmq-22.3.0-py39h37b5a0c_0.tar.bz2#d12d8a39f21c9891768ba4d783d18cc9
-https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml.clib-0.2.2-py39h3811e60_2.tar.bz2#d7770c88f04155fcff2942a1ff750ff1
-https://conda.anaconda.org/conda-forge/linux-64/setuptools-58.2.0-py39hf3d152e_0.tar.bz2#48ce54090622fe6f7f74de598915a8d9
-https://conda.anaconda.org/conda-forge/linux-64/sniffio-1.2.0-py39hf3d152e_1.tar.bz2#a620158b380f03f82e8ceac1397270b7
-https://conda.anaconda.org/conda-forge/linux-64/tornado-6.1-py39h3811e60_1.tar.bz2#763597c8b91b69789ab0f6002439c32b
-https://conda.anaconda.org/conda-forge/linux-64/websocket-client-0.57.0-py39hf3d152e_4.tar.bz2#d4b25baf59c9c67c47dc48ceabd1b750
-https://conda.anaconda.org/conda-forge/linux-64/anyio-3.3.2-py39hf3d152e_0.tar.bz2#5387a97cdb149f7d0dc15880f6c1f9ad
-https://conda.anaconda.org/conda-forge/linux-64/argon2-cffi-20.1.0-py39h3811e60_2.tar.bz2#9e69a6cedbffc71321daf4895b9db5bf
+https://conda.anaconda.org/conda-forge/linux-64/pyzmq-22.3.0-py39h37b5a0c_1.tar.bz2#90dbe11c01a89fc6fddb90cbe2672e68
+https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml.clib-0.2.6-py39h3811e60_0.tar.bz2#0f9bbd7b79db72e3bc9779432de26427
+https://conda.anaconda.org/conda-forge/linux-64/setuptools-60.5.0-py39hf3d152e_0.tar.bz2#25c23d6577edd40d60ce4e022f407118
+https://conda.anaconda.org/conda-forge/linux-64/sniffio-1.2.0-py39hf3d152e_2.tar.bz2#591e48c37143ef758d6ba0da1cf10a6f
+https://conda.anaconda.org/conda-forge/linux-64/tornado-6.1-py39h3811e60_2.tar.bz2#5a7bb7af2f3bcf31ee6cd817de1d5011
+https://conda.anaconda.org/conda-forge/linux-64/typed-ast-1.5.2-py39h3811e60_0.tar.bz2#f26209afd5f3cb9adbf46002061f6214
+https://conda.anaconda.org/conda-forge/linux-64/anyio-3.5.0-py39hf3d152e_0.tar.bz2#b0d75a9d3fd02ec079504aabb7cd7ec3
+https://conda.anaconda.org/conda-forge/linux-64/argon2-cffi-bindings-21.2.0-py39h3811e60_1.tar.bz2#6770ac3b1842046fcb21c2178d67fa32
 https://conda.anaconda.org/conda-forge/noarch/backports.functools_lru_cache-1.6.4-pyhd8ed1ab_0.tar.bz2#c5b3edc62d6309088f4970b3eaaa65a6
+https://conda.anaconda.org/conda-forge/noarch/black-21.12b0-pyhd8ed1ab_0.tar.bz2#a027de51692086f51b9e17735480bebf
 https://conda.anaconda.org/conda-forge/noarch/bleach-4.1.0-pyhd8ed1ab_0.tar.bz2#4a2104c7b22c222bd0fe03aaef12862c
-https://conda.anaconda.org/conda-forge/linux-64/brotlipy-0.7.0-py39h3811e60_1001.tar.bz2#35ad78e61aec955783acfd00f3c6bcde
-https://conda.anaconda.org/conda-forge/linux-64/cryptography-3.4.7-py39hbca0aa6_0.tar.bz2#04e97f7d5c60f75a36b1e4bdf3652ebd
-https://conda.anaconda.org/conda-forge/noarch/jinja2-3.0.1-pyhd8ed1ab_0.tar.bz2#c647e77921fd3e245cdcc5b2d451a0f8
-https://conda.anaconda.org/conda-forge/noarch/jsonschema-4.0.1-pyhd8ed1ab_0.tar.bz2#e51c302441bad8d2fbba17e1e23eac24
-https://conda.anaconda.org/conda-forge/noarch/jupyter_client-7.0.6-pyhd8ed1ab_0.tar.bz2#bad4522cf4a022cb5500969ad67c3342
-https://conda.anaconda.org/conda-forge/noarch/mako-1.1.5-pyhd8ed1ab_0.tar.bz2#e8f5f27557d8a0f6c4ed9950cd622e50
-https://conda.anaconda.org/conda-forge/noarch/pip-21.2.4-pyhd8ed1ab_0.tar.bz2#4104ada314dd5639ea36cc12bce0a2cd
-https://conda.anaconda.org/conda-forge/noarch/pygments-2.10.0-pyhd8ed1ab_0.tar.bz2#32bcce837f1316f1c3208118b6c5e5fc
-https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml-0.17.16-py39h3811e60_0.tar.bz2#9deea133cdd90530091e26db39acfac4
-https://conda.anaconda.org/conda-forge/linux-64/sqlalchemy-1.4.25-py39h3811e60_0.tar.bz2#bae8784c930168588775f9d96feb8720
-https://conda.anaconda.org/conda-forge/linux-64/terminado-0.12.1-py39hf3d152e_0.tar.bz2#2f849f79559879b397218ccb65082836
-https://conda.anaconda.org/conda-forge/noarch/alembic-1.7.3-pyhd8ed1ab_0.tar.bz2#e60694657bfb440e569d043dae99d111
+https://conda.anaconda.org/conda-forge/linux-64/brotlipy-0.7.0-py39h3811e60_1003.tar.bz2#9b1975f772d5d8a398c34e539a7ea1a1
+https://conda.anaconda.org/conda-forge/linux-64/cryptography-36.0.1-py39h95dcef6_0.tar.bz2#986821383dd9622121c1a0b8a745b1e2
+https://conda.anaconda.org/conda-forge/noarch/jinja2-3.0.3-pyhd8ed1ab_0.tar.bz2#036d872c653780cb26e797e2e2f61b4c
+https://conda.anaconda.org/conda-forge/noarch/jsonschema-4.4.0-pyhd8ed1ab_0.tar.bz2#17ec41acce882e5db4efdcc4c01ca7e0
+https://conda.anaconda.org/conda-forge/noarch/jupyter_client-7.1.2-pyhd8ed1ab_0.tar.bz2#9a332b6f8f05629435ce59032df8cfa9
+https://conda.anaconda.org/conda-forge/noarch/mako-1.1.6-pyhd8ed1ab_0.tar.bz2#cb952a55037148f6a5ddd9770ee1384f
+https://conda.anaconda.org/conda-forge/noarch/pip-21.3.1-pyhd8ed1ab_0.tar.bz2#e4fe2a9af78ff11f1aced7e62128c6a8
+https://conda.anaconda.org/conda-forge/noarch/pygments-2.11.2-pyhd8ed1ab_0.tar.bz2#caef60540e2239e27bf62569a5015e3b
+https://conda.anaconda.org/conda-forge/linux-64/ruamel.yaml-0.17.19-py39h3811e60_0.tar.bz2#5e50592662d6b781b7c42fdb4c434e83
+https://conda.anaconda.org/conda-forge/linux-64/sqlalchemy-1.4.31-py39h3811e60_0.tar.bz2#16995a401ab29510c6e7665c9aff030f
+https://conda.anaconda.org/conda-forge/noarch/stack_data-0.1.4-pyhd8ed1ab_0.tar.bz2#e68dcab1b415c3c44be2a51d7d41e921
+https://conda.anaconda.org/conda-forge/linux-64/terminado-0.12.1-py39hf3d152e_1.tar.bz2#3e73d7571460790b8487d03b630b970b
+https://conda.anaconda.org/conda-forge/noarch/alembic-1.7.5-pyhd8ed1ab_0.tar.bz2#1102908123392ffc63c01caea136b1d4
+https://conda.anaconda.org/conda-forge/noarch/argon2-cffi-21.3.0-pyhd8ed1ab_0.tar.bz2#a0b402db58f73aaab8ee0ca1025a362e
 https://conda.anaconda.org/conda-forge/noarch/jupyter_telemetry-0.1.0-pyhd8ed1ab_1.tar.bz2#bb9ebdb6d5aa2622484aff1faceee181
 https://conda.anaconda.org/conda-forge/noarch/jupyterlab_pygments-0.1.2-pyh9f0ad1d_0.tar.bz2#2cbd910890bb328e8959246a1e16fac7
 https://conda.anaconda.org/conda-forge/noarch/nbformat-5.1.3-pyhd8ed1ab_0.tar.bz2#bafa5df6d4f8db69a4d197b4657127e7
@@ -114,23 +134,22 @@ https://conda.anaconda.org/conda-forge/noarch/oauthlib-3.1.1-pyhd8ed1ab_0.tar.bz
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-21.0.0-pyhd8ed1ab_0.tar.bz2#8c49efecb7dca466e18b06015e8c88ce
 https://conda.anaconda.org/conda-forge/noarch/wcwidth-0.2.5-pyh9f0ad1d_2.tar.bz2#5266fcd697043c59621fda522b3d78ee
 https://conda.anaconda.org/conda-forge/noarch/certipy-0.1.3-py_0.tar.bz2#23486713ef5712923e7c57cae609b22e
-https://conda.anaconda.org/conda-forge/noarch/nbclient-0.5.4-pyhd8ed1ab_0.tar.bz2#66ea0ea89e4f657a8b85fa5bdfce60ac
-https://conda.anaconda.org/conda-forge/noarch/prompt-toolkit-3.0.20-pyha770c72_0.tar.bz2#98a90e847b48fc14b2d5b12e4884e8d4
-https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.7-pyhd8ed1ab_0.tar.bz2#be75bab4820a56f77ba1a3fc9139c36a
-https://conda.anaconda.org/conda-forge/linux-64/ipython-7.28.0-py39hef51801_0.tar.bz2#65c72c04ddd3c85a76116a3eaec86edc
+https://conda.anaconda.org/conda-forge/noarch/nbclient-0.5.10-pyhd8ed1ab_1.tar.bz2#000cfe33d6fa746c5a9d1b29a79342a3
+https://conda.anaconda.org/conda-forge/noarch/prompt-toolkit-3.0.24-pyha770c72_0.tar.bz2#edaf527a6d394e2b965aff228c2e552f
+https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.8-pyhd8ed1ab_1.tar.bz2#53f1387c68c21cecb386e2cde51b3f7c
+https://conda.anaconda.org/conda-forge/linux-64/ipython-8.0.1-py39hf3d152e_0.tar.bz2#d84d046c9dbdfe7b1b1b722e6369daab
 https://conda.anaconda.org/conda-forge/linux-64/nbconvert-6.0.7-py39hf3d152e_3.tar.bz2#5f914e1113c7a926798c7659efbcd6a3
-https://conda.anaconda.org/conda-forge/noarch/requests-2.26.0-pyhd8ed1ab_0.tar.bz2#0ed2ccbde6db9dd5789068eb7194463f
-https://conda.anaconda.org/conda-forge/linux-64/ipykernel-6.4.1-py39hef51801_0.tar.bz2#7d8d57f6359342fb633e913c9876cfeb
+https://conda.anaconda.org/conda-forge/noarch/requests-2.27.1-pyhd8ed1ab_0.tar.bz2#7c1c427246b057b8fa97200ecdb2ed62
+https://conda.anaconda.org/conda-forge/linux-64/ipykernel-6.7.0-py39hef51801_0.tar.bz2#673ae0bc269066e8ddabc7c912739e79
+https://conda.anaconda.org/conda-forge/noarch/jupyter_server-1.13.4-pyhd8ed1ab_0.tar.bz2#70c6e1f755731d858767cb3c08c56a95
 https://conda.anaconda.org/conda-forge/linux-64/jupyterhub-base-1.4.2-py39hf3d152e_0.tar.bz2#07d2be5eb6460d504a0291cb2aa8328a
-https://conda.anaconda.org/conda-forge/noarch/requests-unixsocket-0.2.0-py_0.tar.bz2#1e94a233d2f2c81b2bf11bd43a515fbe
-https://conda.anaconda.org/conda-forge/noarch/jupyter_server-1.11.1-pyhd8ed1ab_0.tar.bz2#8861413be89425f2c32ec15ad098aeb5
-https://conda.anaconda.org/conda-forge/linux-64/notebook-6.3.0-py39hf3d152e_0.tar.bz2#768afe25d9d82f590b8db716288c7259
-https://conda.anaconda.org/conda-forge/noarch/jupyter-offlinenotebook-0.2.1-pyhd8ed1ab_0.tar.bz2#5e0974a4547a2b82667f65a6498c4145
-https://conda.anaconda.org/conda-forge/noarch/jupyter-resource-usage-0.6.0-pyhd8ed1ab_0.tar.bz2#db6c08b360baeacba755a78d0a1ecabb
+https://conda.anaconda.org/conda-forge/noarch/jupyter-resource-usage-0.6.1-pyhd8ed1ab_0.tar.bz2#a35cb988cd5b9b9b2d1c6179a8a86974
+https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.10.3-pyhd8ed1ab_0.tar.bz2#65d62a616bed5237b85b9e2a88378ec0
+https://conda.anaconda.org/conda-forge/noarch/notebook-6.3.0-pyha770c72_1.tar.bz2#6a53111a5a62d32abfa21aac8fc55a1b
+https://conda.anaconda.org/conda-forge/noarch/jupyter-offlinenotebook-0.2.2-pyh1d7be83_0.tar.bz2#fe55056ce4bc4bd4953ba440270735fb
 https://conda.anaconda.org/conda-forge/linux-64/jupyterhub-singleuser-1.4.2-py39hf3d152e_0.tar.bz2#176c4f6b76330d7c6f8534640c6cc193
-https://conda.anaconda.org/conda-forge/noarch/jupyterlab_server-2.8.2-pyhd8ed1ab_0.tar.bz2#c7891bb53fbb3911f4b526533314d63b
-https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.3.2-pyhd8ed1ab_0.tar.bz2#289b4ac8e8ce489d747ef9e4d5e1d4d2
+https://conda.anaconda.org/conda-forge/noarch/nbclassic-0.3.5-pyhd8ed1ab_0.tar.bz2#e9e2281b7dc08d876fc789af0f571ade
 https://conda.anaconda.org/conda-forge/noarch/nteract_on_jupyter-2.1.3-py_0.tar.bz2#1430ccd983ae6b161e2fbf4377965f7a
-https://conda.anaconda.org/conda-forge/linux-64/widgetsnbextension-3.5.1-py39hf3d152e_4.tar.bz2#ae54c7d751b678c0021929892d598ecd
-https://conda.anaconda.org/conda-forge/noarch/ipywidgets-7.6.3-pyhd3deb0d_0.tar.bz2#536a9ed6d9e740f2b83d1a3c388e4388
-https://conda.anaconda.org/conda-forge/noarch/jupyterlab-3.1.17-pyhd8ed1ab_0.tar.bz2#22bf1d0a87a7015dc51140372ea950fa
+https://conda.anaconda.org/conda-forge/linux-64/widgetsnbextension-3.5.2-py39hf3d152e_1.tar.bz2#26c83eb2efd87c9bbef958b9f7117559
+https://conda.anaconda.org/conda-forge/noarch/ipywidgets-7.6.5-pyhd8ed1ab_0.tar.bz2#6f2ee1ec157104df141e2e5afeba98d4
+https://conda.anaconda.org/conda-forge/noarch/jupyterlab-3.2.8-pyhd8ed1ab_0.tar.bz2#e2cc0671571f14af58f832c912dee025
diff --git a/repo2docker/buildpacks/conda/environment.py-3.9.yml b/repo2docker/buildpacks/conda/environment.py-3.9.yml
index 8d1c7e565..fa80fb7a8 100644
--- a/repo2docker/buildpacks/conda/environment.py-3.9.yml
+++ b/repo2docker/buildpacks/conda/environment.py-3.9.yml
@@ -1,14 +1,16 @@
 # AUTO GENERATED FROM environment.yml, DO NOT MANUALLY MODIFY
-# Generated on 2021-10-06 07:34:05 UTC
+# Generated on 2022-01-26 18:36:36 UTC
 channels:
 - conda-forge
 dependencies:
 - python=3.9.*
+- nodejs=14
 - pip
-- ipywidgets==7.6.3
-- jupyter-offlinenotebook==0.2.1
-- jupyter-resource-usage==0.6.0
-- jupyterlab==3.1.17
+- ipywidgets==7.6.5
+- jupyter-offlinenotebook==0.2.2
+- jupyter-resource-usage==0.6.1
+- jupyterlab==3.2.8
+  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
 - jupyterhub-singleuser==1.4.2
   # Newer versions require python 3.7
 - nbconvert==6.0.7
diff --git a/repo2docker/buildpacks/conda/environment.yml b/repo2docker/buildpacks/conda/environment.yml
index 35d1b07d8..218ccc1f6 100644
--- a/repo2docker/buildpacks/conda/environment.yml
+++ b/repo2docker/buildpacks/conda/environment.yml
@@ -2,11 +2,13 @@ channels:
   - conda-forge
 dependencies:
   - python=3.7
+  - nodejs=14
   - pip
-  - ipywidgets==7.6.3
-  - jupyter-offlinenotebook==0.2.1
-  - jupyter-resource-usage==0.6.0
-  - jupyterlab==3.1.17
+  - ipywidgets==7.6.5
+  - jupyter-offlinenotebook==0.2.2
+  - jupyter-resource-usage==0.6.1
+  - jupyterlab==3.2.8
+  # jupyterhub-singleuser==1.5.0 won't install with python 3.6 (but 2.0.1 does!)
   - jupyterhub-singleuser==1.4.2
   # Newer versions require python 3.7
   - nbconvert==6.0.7
diff --git a/repo2docker/buildpacks/conda/freeze.py b/repo2docker/buildpacks/conda/freeze.py
index 3f6085b15..a4aa09315 100755
--- a/repo2docker/buildpacks/conda/freeze.py
+++ b/repo2docker/buildpacks/conda/freeze.py
@@ -9,6 +9,7 @@
 python freeze.py [3.8]
 """
 
+from argparse import ArgumentParser
 from datetime import datetime
 import os
 import pathlib
@@ -106,10 +107,21 @@ def set_python(py_env_file, py):
 
 
 if __name__ == "__main__":
-    # allow specifying which Pythons to update on argv
-    pys = sys.argv[1:] or ("2.7", "3.6", "3.7", "3.8", "3.9")
+    parser = ArgumentParser(
+        description=(
+            "Refreeze conda environments. See "
+            "https://repo2docker.readthedocs.io/en/latest/contributing/tasks.html#update-and-freeze-buildpack-dependencies"
+        )
+    )
+    parser.add_argument(
+        "py",
+        nargs="*",
+        help="Python version(s) to update and freeze",
+        default=("2.7", "3.6", "3.7", "3.8", "3.9"),
+    )
+    args = parser.parse_args()
     default_py = "3.7"
-    for py in pys:
+    for py in args.py:
         env_file = pathlib.Path(str(ENV_FILE_T).format(py=py))
         set_python(env_file, py)
         frozen_file = pathlib.Path(os.path.splitext(env_file)[0] + ".lock")
diff --git a/repo2docker/buildpacks/conda/install-base-env.bash b/repo2docker/buildpacks/conda/install-base-env.bash
new file mode 100755
index 000000000..658500367
--- /dev/null
+++ b/repo2docker/buildpacks/conda/install-base-env.bash
@@ -0,0 +1,87 @@
+#!/bin/bash
+# This downloads and installs a pinned version of micromamba
+# and sets up the base environment
+set -ex
+
+cd $(dirname $0)
+
+export MAMBA_VERSION=0.19.1
+export CONDA_VERSION=4.11.0
+
+URL="https://anaconda.org/conda-forge/micromamba/${MAMBA_VERSION}/download/linux-64/micromamba-${MAMBA_VERSION}-0.tar.bz2"
+
+# make sure we don't do anything funky with user's $HOME
+# since this is run as root
+unset HOME
+mkdir -p ${CONDA_DIR}
+
+export MICROMAMBA_EXE="/usr/local/bin/micromamba"
+
+time wget -qO- ${URL} | tar -xvj bin/micromamba
+mv bin/micromamba "$MICROMAMBA_EXE"
+chmod 0755 "$MICROMAMBA_EXE"
+
+eval "$(${MICROMAMBA_EXE} shell hook -p ${CONDA_DIR} -s posix)"
+
+micromamba activate
+
+export PATH="${PWD}/bin:$PATH"
+
+cat <<EOT >> ${CONDA_DIR}/.condarc
+channels:
+  - conda-forge
+  - defaults
+auto_update_conda: false
+show_channel_urls: true
+update_dependencies: false
+# channel_priority: flexible
+EOT
+
+micromamba install conda=${CONDA_VERSION} mamba=${MAMBA_VERSION} -y
+
+echo "installing notebook env:"
+cat "${NB_ENVIRONMENT_FILE}"
+
+
+time ${MAMBA_EXE} create -p ${NB_PYTHON_PREFIX} --file "${NB_ENVIRONMENT_FILE}"
+
+if [[ ! -z "${NB_REQUIREMENTS_FILE:-}" ]]; then
+    echo "installing pip requirements"
+    cat "${NB_REQUIREMENTS_FILE}"
+    ${NB_PYTHON_PREFIX}/bin/python -mpip install --no-cache --no-deps -r "${NB_REQUIREMENTS_FILE}"
+fi
+# empty conda history file,
+# which seems to result in some effective pinning of packages in the initial env,
+# which we don't intend.
+# this file must not be *removed*, however
+echo '' > ${NB_PYTHON_PREFIX}/conda-meta/history
+
+if [[ ! -z "${KERNEL_ENVIRONMENT_FILE:-}" ]]; then
+    # install kernel env and register kernelspec
+    echo "installing kernel env:"
+    cat "${KERNEL_ENVIRONMENT_FILE}"
+    time ${MAMBA_EXE} create -p ${KERNEL_PYTHON_PREFIX} --file "${KERNEL_ENVIRONMENT_FILE}"
+
+    if [[ ! -z "${KERNEL_REQUIREMENTS_FILE:-}" ]]; then
+        echo "installing pip requirements for kernel"
+        cat "${KERNEL_REQUIREMENTS_FILE}"
+        ${KERNEL_PYTHON_PREFIX}/bin/python -mpip install --no-cache --no-deps -r "${KERNEL_REQUIREMENTS_FILE}"
+    fi
+
+    ${KERNEL_PYTHON_PREFIX}/bin/ipython kernel install --prefix "${NB_PYTHON_PREFIX}"
+    echo '' > ${KERNEL_PYTHON_PREFIX}/conda-meta/history
+    ${MAMBA_EXE} list -p ${KERNEL_PYTHON_PREFIX}
+fi
+
+# Clean things out!
+time ${MAMBA_EXE} clean --all -f -y
+
+# Remove the pip cache created as part of installing micromamba
+rm -rf /root/.cache
+
+chown -R $NB_USER:$NB_USER ${CONDA_DIR}
+
+${MAMBA_EXE} list -p ${NB_PYTHON_PREFIX}
+
+# Set NPM config
+${NB_PYTHON_PREFIX}/bin/npm config --global set prefix ${NPM_DIR}
diff --git a/repo2docker/buildpacks/conda/install-miniforge.bash b/repo2docker/buildpacks/conda/install-miniforge.bash
deleted file mode 100755
index 3c99b6a07..000000000
--- a/repo2docker/buildpacks/conda/install-miniforge.bash
+++ /dev/null
@@ -1,92 +0,0 @@
-#!/bin/bash
-# This downloads and installs a pinned version of miniforge
-# and sets up the base environment
-set -ex
-
-
-cd $(dirname $0)
-MINIFORGE_VERSION=4.9.2-2
-MAMBA_VERSION=0.7.4
-# SHA256 for installers can be obtained from https://github.com/conda-forge/miniforge/releases
-SHA256SUM="7a7bfaff87680298304a97ba69bcf92f66c810995a7155a2918b99fafb8ca1dc"
-
-URL="https://github.com/conda-forge/miniforge/releases/download/${MINIFORGE_VERSION}/Mambaforge-${MINIFORGE_VERSION}-Linux-x86_64.sh"
-INSTALLER_PATH=/tmp/miniforge-installer.sh
-
-# make sure we don't do anything funky with user's $HOME
-# since this is run as root
-unset HOME
-
-time wget --quiet $URL -O ${INSTALLER_PATH}
-chmod +x ${INSTALLER_PATH}
-
-# check sha256 checksum
-if ! echo "${SHA256SUM}  ${INSTALLER_PATH}" | sha256sum  --quiet -c -; then
-    echo "sha256 mismatch for ${INSTALLER_PATH}, exiting!"
-    exit 1
-fi
-
-time bash ${INSTALLER_PATH} -b -p ${CONDA_DIR}
-export PATH="${CONDA_DIR}/bin:$PATH"
-
-# Preserve behavior of miniconda - packages come from conda-forge + defaults
-conda config --system --append channels defaults
-
-# Do not attempt to auto update conda or dependencies
-conda config --system --set auto_update_conda false
-conda config --system --set show_channel_urls true
-
-# bug in conda 4.3.>15 prevents --set update_dependencies
-echo 'update_dependencies: false' >> ${CONDA_DIR}/.condarc
-
-# avoid future changes to default channel_priority behavior
-conda config --system --set channel_priority "flexible"
-
-time mamba install -y mamba==${MAMBA_VERSION}
-
-echo "installing notebook env:"
-cat "${NB_ENVIRONMENT_FILE}"
-
-time mamba create -p ${NB_PYTHON_PREFIX} --file "${NB_ENVIRONMENT_FILE}"
-
-if [[ ! -z "${NB_REQUIREMENTS_FILE:-}" ]]; then
-    echo "installing pip requirements"
-    cat "${NB_REQUIREMENTS_FILE}"
-    ${NB_PYTHON_PREFIX}/bin/python -mpip install --no-cache --no-deps -r "${NB_REQUIREMENTS_FILE}"
-fi
-# empty conda history file,
-# which seems to result in some effective pinning of packages in the initial env,
-# which we don't intend.
-# this file must not be *removed*, however
-echo '' > ${NB_PYTHON_PREFIX}/conda-meta/history
-
-if [[ ! -z "${KERNEL_ENVIRONMENT_FILE:-}" ]]; then
-    # install kernel env and register kernelspec
-    echo "installing kernel env:"
-    cat "${KERNEL_ENVIRONMENT_FILE}"
-    time mamba create -p ${KERNEL_PYTHON_PREFIX} --file "${KERNEL_ENVIRONMENT_FILE}"
-
-    if [[ ! -z "${KERNEL_REQUIREMENTS_FILE:-}" ]]; then
-        echo "installing pip requirements for kernel"
-        cat "${KERNEL_REQUIREMENTS_FILE}"
-        ${KERNEL_PYTHON_PREFIX}/bin/python -mpip install --no-cache --no-deps -r "${KERNEL_REQUIREMENTS_FILE}"
-    fi
-
-    ${KERNEL_PYTHON_PREFIX}/bin/ipython kernel install --prefix "${NB_PYTHON_PREFIX}"
-    echo '' > ${KERNEL_PYTHON_PREFIX}/conda-meta/history
-    mamba list -p ${KERNEL_PYTHON_PREFIX}
-fi
-
-# Clean things out!
-time mamba clean --all -f -y
-
-# Remove the big installer so we don't increase docker image size too much
-rm ${INSTALLER_PATH}
-
-# Remove the pip cache created as part of installing miniforge
-rm -rf /root/.cache
-
-chown -R $NB_USER:$NB_USER ${CONDA_DIR}
-
-mamba list -n root
-mamba list -p ${NB_PYTHON_PREFIX}
diff --git a/repo2docker/buildpacks/docker.py b/repo2docker/buildpacks/docker.py
index 8326aecfe..5f0c2fb33 100644
--- a/repo2docker/buildpacks/docker.py
+++ b/repo2docker/buildpacks/docker.py
@@ -52,6 +52,7 @@ def build(
             buildargs=build_args,
             container_limits=limits,
             cache_from=cache_from,
+            labels=self.get_labels(),
         )
 
         build_kwargs.update(extra_build_kwargs)
diff --git a/repo2docker/buildpacks/julia/julia_project.py b/repo2docker/buildpacks/julia/julia_project.py
index b340acbd2..9a569e519 100644
--- a/repo2docker/buildpacks/julia/julia_project.py
+++ b/repo2docker/buildpacks/julia/julia_project.py
@@ -1,10 +1,13 @@
 """Generates a Dockerfile based on an input matrix for Julia"""
 import functools
 import os
+
 import requests
+import semver
 import toml
+
 from ..python import PythonBuildPack
-from .semver import find_semver_match, semver
+from ...semver import find_semver_match
 
 
 class JuliaProjectTomlBuildPack(PythonBuildPack):
diff --git a/repo2docker/buildpacks/julia/julia_require.py b/repo2docker/buildpacks/julia/julia_require.py
index b4e4f35e0..075b928e0 100644
--- a/repo2docker/buildpacks/julia/julia_require.py
+++ b/repo2docker/buildpacks/julia/julia_require.py
@@ -1,9 +1,9 @@
 """Generates a Dockerfile based on an input matrix with REQUIRE for legacy Julia"""
 
-from distutils.version import LooseVersion as V
 import os
 
 from ..python import PythonBuildPack
+from ...semver import parse_version as V
 
 
 class JuliaRequireBuildPack(PythonBuildPack):
diff --git a/repo2docker/buildpacks/r.py b/repo2docker/buildpacks/r.py
index 2df72982c..9a734a47d 100644
--- a/repo2docker/buildpacks/r.py
+++ b/repo2docker/buildpacks/r.py
@@ -3,10 +3,10 @@
 import datetime
 import requests
 
-from distutils.version import LooseVersion as V
 
+from ..semver import parse_version as V
 from .python import PythonBuildPack
-from ._r_base import rstudio_base_scripts, DEVTOOLS_VERSION, IRKERNEL_VERSION
+from ._r_base import rstudio_base_scripts
 
 
 class RBuildPack(PythonBuildPack):
@@ -20,25 +20,27 @@ class RBuildPack(PythonBuildPack):
        r-<year>-<month>-<date>
 
        Where 'year', 'month' and 'date' refer to a specific
-       date snapshot of https://mran.microsoft.com/timemachine
-       from which libraries are to be installed.
+       date whose CRAN snapshot we will use to fetch packages.
+       Uses https://packagemanager.rstudio.com, or MRAN if no snapshot
+       is found on packagemanager.rstudio.com
 
     2. A `DESCRIPTION` file signaling an R package
 
-    If there is no `runtime.txt`, then the MRAN snapshot is set to latest
+    If there is no `runtime.txt`, then the CRAN snapshot is set to latest
     date that is guaranteed to exist across timezones.
 
     Additional R packages are installed if specified either
 
     - in a file `install.R`, that will be executed at build time,
-      and can be used for installing packages from both MRAN and GitHub
+      and can be used for installing packages from both CRAN and GitHub
 
     - as dependencies in a `DESCRIPTION` file
 
     - are needed by a specific tool
 
-    The `r-base` package from Ubuntu apt repositories is used to install
-    R itself, rather than any of the methods from https://cran.r-project.org/.
+    The `r-base-core` package from Ubuntu or "Ubuntu packages for R"
+    apt repositories is used to install R itself,
+    rather than any of the methods from https://cran.r-project.org/.
 
     The `r-base-dev` package is installed as advised in RStudio instructions.
     """
@@ -72,14 +74,15 @@ def r_version(self):
             "3.5.1": "3.5.1-2bionic",
             "3.5.2": "3.5.2-1bionic",
             "3.5.3": "3.5.3-1bionic",
-            "3.6": "3.6.1-3bionic",
+            "3.6": "3.6.3-1bionic",
             "3.6.0": "3.6.0-2bionic",
             "3.6.1": "3.6.1-3bionic",
-            "4.0": "4.0.2-1.1804.0",
+            "4.0": "4.0.5-1.1804.0",
             "4.0.2": "4.0.2-1.1804.0",
+            "4.1": "4.1.2-1.1804.0",
         }
         # the default if nothing is specified
-        r_version = "3.6"
+        r_version = "4.1"
 
         if not hasattr(self, "_r_version"):
             parts = self.runtime.split("-")
@@ -98,7 +101,7 @@ def r_version(self):
     @property
     def checkpoint_date(self):
         """
-        Return the date of MRAN checkpoint to use for this repo
+        Return the date of CRAN checkpoint to use for this repo
 
         Returns '' if no date is specified
         """
@@ -131,11 +134,9 @@ def detect(self):
         if not self.binder_dir and os.path.exists(description_R):
             if not self.checkpoint_date:
                 # no R snapshot date set through runtime.txt
-                # set the R runtime to the latest date that is guaranteed to
-                # be on MRAN across timezones
-                two_days_ago = datetime.date.today() - datetime.timedelta(days=2)
-                self._checkpoint_date = self._get_latest_working_mran_date(
-                    two_days_ago, 3
+                # Set it to two days ago from today
+                self._checkpoint_date = datetime.date.today() - datetime.timedelta(
+                    days=2
                 )
                 self._runtime = "r-{}".format(str(self._checkpoint_date))
             return True
@@ -177,7 +178,7 @@ def get_packages(self):
             "lsb-release",
         ]
         # For R 3.4 we use the default Ubuntu package, for other versions we
-        # install from a different PPA
+        # install from a different apt repository
         if V(self.r_version) < V("3.5"):
             packages.append("r-base")
             packages.append("r-base-dev")
@@ -185,28 +186,65 @@ def get_packages(self):
 
         return super().get_packages().union(packages)
 
-    def _get_latest_working_mran_date(self, startdate, max_prior):
-        """
-        Look for a working MRAN snapshot
-
-        Starts from `startdate` and tries up to `max_prior` previous days.
-        Raises `requests.HTTPError` with the last tried URL if no working snapshot found.
-        """
-        for days in range(max_prior + 1):
-            test_date = startdate - datetime.timedelta(days=days)
-            mran_url = "https://mran.microsoft.com/snapshot/{}".format(
-                test_date.isoformat()
+    def get_rspm_snapshot_url(self, snapshot_date, max_days_prior=7):
+        for i in range(max_days_prior):
+            snapshots = requests.post(
+                "https://packagemanager.rstudio.com/__api__/url",
+                # Ask for midnight UTC snapshot
+                json={
+                    "repo": "all",
+                    "snapshot": (snapshot_date - datetime.timedelta(days=i)).strftime(
+                        "%Y-%m-%dT00:00:00Z"
+                    ),
+                },
+            ).json()
+            # Construct a snapshot URL that will give us binary packages for Ubuntu Bionic (18.04)
+            if "upsi" in snapshots:
+                return (
+                    "https://packagemanager.rstudio.com/all/__linux__/bionic/"
+                    + snapshots["upsi"]
+                )
+        raise ValueError(
+            "No snapshot found for {} or {} days prior in packagemanager.rstudio.com".format(
+                snapshot_date.strftime("%Y-%m-%d"), max_days_prior
             )
-            r = requests.head(mran_url)
+        )
+
+    def get_mran_snapshot_url(self, snapshot_date, max_days_prior=7):
+        for i in range(max_days_prior):
+            try_date = snapshot_date - datetime.timedelta(days=i)
+            # Fall back to MRAN if packagemanager.rstudio.com doesn't have it
+            url = "https://mran.microsoft.com/snapshot/{}".format(try_date.isoformat())
+            r = requests.head(url)
             if r.ok:
-                return test_date
-            self.log.warning(
-                "Failed to get MRAN snapshot URL %s: %s %s",
-                mran_url,
-                r.status_code,
-                r.reason,
+                return url
+        raise ValueError(
+            "No snapshot found for {} or {} days prior in mran.microsoft.com".format(
+                snapshot_date.strftime("%Y-%m-%d"), max_days_prior
             )
-        r.raise_for_status()
+        )
+
+    def get_cran_mirror_url(self, snapshot_date):
+        # Date after which we will use rspm + binary packages instead of MRAN + source packages
+        rspm_cutoff_date = datetime.date(2022, 1, 1)
+
+        if snapshot_date >= rspm_cutoff_date or self.r_version >= V("4.1"):
+            return self.get_rspm_snapshot_url(snapshot_date)
+        else:
+            return self.get_mran_snapshot_url(snapshot_date)
+
+    def get_devtools_snapshot_url(self):
+        """
+        Return url of snapshot to use for getting devtools install
+
+        devtools is part of our 'core' base install, so we should have some
+        control over what version we install here.
+        """
+        # Picked from https://packagemanager.rstudio.com/client/#/repos/1/overview
+        # Hardcoded rather than dynamically determined from a date to avoid extra API calls
+        # Plus, we can always use packagemanager.rstudio.com here as we always install the
+        # necessary apt packages.
+        return "https://packagemanager.rstudio.com/all/__linux__/bionic/2022-01-04+Y3JhbiwyOjQ1MjYyMTU7NzlBRkJEMzg"
 
     def get_build_scripts(self):
         """
@@ -220,7 +258,7 @@ def get_build_scripts(self):
           for installing R packages into
         - RStudio
         - R's devtools package, at a particular frozen version
-          (determined by MRAN)
+          (determined by CRAN)
         - IRKernel
         - nbrsessionproxy (to access RStudio via Jupyter Notebook)
 
@@ -228,61 +266,61 @@ def get_build_scripts(self):
         contents of runtime.txt.
         """
 
-        mran_url = "https://mran.microsoft.com/snapshot/{}".format(
-            self.checkpoint_date.isoformat()
-        )
+        cran_mirror_url = self.get_cran_mirror_url(self.checkpoint_date)
 
-        scripts = []
-        # For R 3.4 we want to use the default Ubuntu package but otherwise
-        # we use the packages from R's own repo
+        # Determine which R apt repository should be enabled
         if V(self.r_version) >= V("3.5"):
             if V(self.r_version) >= V("4"):
                 vs = "40"
             else:
                 vs = "35"
-            scripts += [
-                (
-                    "root",
-                    rf"""
-                    echo "deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran{vs}/" > /etc/apt/sources.list.d/r-ubuntu.list
-                    """,
-                ),
-                # Dont use apt-key directly, as gpg does not always respect *_proxy vars. This increase the chances
-                # of being able to reach it from behind a firewall
-                (
-                    "root",
-                    r"""
-                    wget --quiet -O - 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xe298a3a825c0d65dfd57cbb651716619e084dab9' | apt-key add -
-                    """,
-                ),
-                (
-                    "root",
-                    r"""
-                    apt-get update && \
-                    apt-get install --yes r-base={R_version} \
-                         r-base-dev={R_version} \
-                         r-recommended={R_version} \
-                         libclang-dev && \
-                    apt-get -qq purge && \
-                    apt-get -qq clean && \
-                    rm -rf /var/lib/apt/lists/*
-                    """.format(
-                        R_version=self.r_version
-                    ),
+
+        scripts = [
+            (
+                "root",
+                rf"""
+                echo "deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran{vs}/" > /etc/apt/sources.list.d/r-ubuntu.list
+                """,
+            ),
+            # Dont use apt-key directly, as gpg does not always respect *_proxy vars. This increase the chances
+            # of being able to reach it from behind a firewall
+            (
+                "root",
+                r"""
+                wget --quiet -O - 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xe298a3a825c0d65dfd57cbb651716619e084dab9' | apt-key add -
+                """,
+            ),
+            (
+                "root",
+                # we should have --no-install-recommends on all our apt-get install commands,
+                # but here it's important because it will pull in CRAN packages
+                # via r-recommends, which is only guaranteed to be compatible with the latest r-base-core
+                r"""
+                apt-get update > /dev/null && \
+                apt-get install --yes --no-install-recommends \
+                        r-base-core={R_version} \
+                        r-base-dev={R_version} \
+                        libclang-dev \
+                        libzmq3-dev > /dev/null && \
+                apt-get -qq purge && \
+                apt-get -qq clean && \
+                rm -rf /var/lib/apt/lists/*
+                """.format(
+                    R_version=self.r_version
                 ),
-            ]
+            ),
+        ]
+
+        scripts += rstudio_base_scripts(self.r_version)
 
-        scripts.append(
+        scripts += [
             (
                 "root",
                 r"""
                 mkdir -p ${R_LIBS_USER} && \
                 chown -R ${NB_USER}:${NB_USER} ${R_LIBS_USER}
                 """,
-            )
-        )
-        scripts += rstudio_base_scripts()
-        scripts += [
+            ),
             (
                 "root",
                 # Set paths so that RStudio shares libraries with base R
@@ -294,33 +332,30 @@ def get_build_scripts(self):
                 """,
             ),
             (
-                "${NB_USER}",
-                # Install a pinned version of IRKernel and set it up for use!
+                "root",
+                # RStudio's CRAN mirror needs this to figure out which binary package to serve.
+                # If not set properly, it will just serve up source packages
+                # Quite hilarious, IMO.
+                # See https://docs.rstudio.com/rspm/1.0.12/admin/binaries.html
+                # Set mirror for RStudio too, by modifying rsession.conf
                 r"""
-                R --quiet -e "install.packages('devtools', repos='https://mran.microsoft.com/snapshot/{devtools_version}', method='libcurl')" && \
-                R --quiet -e "devtools::install_github('IRkernel/IRkernel', ref='{irkernel_version}')" && \
-                R --quiet -e "IRkernel::installspec(prefix='$NB_PYTHON_PREFIX')"
+                R RHOME && \
+                mkdir -p /usr/lib/R/etc /etc/rstudio && \
+                echo 'options(repos = c(CRAN = "{cran_mirror_url}"))' > /usr/lib/R/etc/Rprofile.site && \
+                echo 'options(HTTPUserAgent = sprintf("R/%s R (%s)", getRversion(), paste(getRversion(), R.version$platform, R.version$arch, R.version$os)))' >> /usr/lib/R/etc/Rprofile.site && \
+                echo 'r-cran-repos={cran_mirror_url}' > /etc/rstudio/rsession.conf
                 """.format(
-                    devtools_version=DEVTOOLS_VERSION, irkernel_version=IRKERNEL_VERSION
+                    cran_mirror_url=cran_mirror_url
                 ),
             ),
             (
                 "${NB_USER}",
-                # Install shiny library
+                # Install a pinned version of devtools, IRKernel and shiny
                 r"""
-                R --quiet -e "install.packages('shiny', repos='{}', method='libcurl')"
-                """.format(
-                    mran_url
-                ),
-            ),
-            (
-                "root",
-                # We set the default CRAN repo to the MRAN one at given date
-                # We set download method to be curl so we get HTTPS support
-                r"""
-                echo "options(repos = c(CRAN='{mran_url}'), download.file.method = 'libcurl')" > /etc/R/Rprofile.site
+                R --quiet -e "install.packages(c('devtools', 'IRkernel', 'shiny'), repos='{devtools_cran_mirror_url}')" && \
+                R --quiet -e "IRkernel::installspec(prefix='$NB_PYTHON_PREFIX')"
                 """.format(
-                    mran_url=mran_url
+                    devtools_cran_mirror_url=self.get_devtools_snapshot_url()
                 ),
             ),
         ]
@@ -352,7 +387,10 @@ def get_preassemble_scripts(self):
             scripts += [
                 (
                     "${NB_USER}",
-                    "Rscript %s && touch /tmp/.preassembled || true" % installR_path,
+                    # Delete /tmp/downloaded_packages only if install.R fails, as the second
+                    # invocation of install.R might be able to reuse them
+                    "Rscript %s && touch /tmp/.preassembled || true && rm -rf /tmp/downloaded_packages"
+                    % installR_path,
                 )
             ]
 
@@ -368,7 +406,8 @@ def get_assemble_scripts(self):
                 (
                     "${NB_USER}",
                     # only run install.R if the pre-assembly failed
-                    "if [ ! -f /tmp/.preassembled ]; then Rscript {}; fi".format(
+                    # Delete any downloaded packages in /tmp, as they aren't reused by R
+                    """if [ ! -f /tmp/.preassembled ]; then Rscript {}; rm -rf /tmp/downloaded_packages; fi""".format(
                         installR_path
                     ),
                 )
diff --git a/repo2docker/docker.py b/repo2docker/docker.py
index c1f3b4188..6b9099fd3 100644
--- a/repo2docker/docker.py
+++ b/repo2docker/docker.py
@@ -3,6 +3,7 @@
 """
 
 import docker
+from traitlets import Dict
 from iso8601 import parse_date
 
 from .engine import Container, ContainerEngine, ContainerEngineException, Image
@@ -53,12 +54,27 @@ class DockerEngine(ContainerEngine):
 
     string_output = False
 
+    extra_init_args = Dict(
+        {},
+        help="""
+        Extra kwargs to pass to docker client when initializing it.
+
+        Dictionary that allows users to specify extra parameters to pass
+        to APIClient, parameters listed in https://docker-py.readthedocs.io/en/stable/api.html#docker.api.client.APIClient.
+
+        Parameters here are merged with whatever is picked up from the
+        environment.
+        """,
+        config=True,
+    )
+
     def __init__(self, *, parent):
         super().__init__(parent=parent)
         try:
-            self._apiclient = docker.APIClient(
-                version="auto", **docker.utils.kwargs_from_env()
-            )
+            kwargs = docker.utils.kwargs_from_env()
+            kwargs.update(self.extra_init_args)
+            kwargs.setdefault("version", "auto")
+            self._apiclient = docker.APIClient(**kwargs)
         except docker.errors.DockerException as e:
             raise ContainerEngineException("Check if docker is running on the host.", e)
 
@@ -73,6 +89,7 @@ def build(
         dockerfile="",
         fileobj=None,
         path="",
+        labels=None,
         **kwargs,
     ):
         return self._apiclient.build(
@@ -87,6 +104,7 @@ def build(
             dockerfile=dockerfile,
             fileobj=fileobj,
             path=path,
+            labels=labels,
             **kwargs,
         )
 
diff --git a/repo2docker/engine.py b/repo2docker/engine.py
index 4b2a62015..9b5e92eb2 100644
--- a/repo2docker/engine.py
+++ b/repo2docker/engine.py
@@ -176,6 +176,7 @@ def build(
         dockerfile="",
         fileobj=None,
         path="",
+        labels=None,
         **kwargs,
     ):
         """
@@ -204,6 +205,8 @@ def build(
             A tar file-like object containing the build context
         path : str
             path to the Dockerfile
+        labels : dict
+            Dictionary of labels to set on the image
 
         Returns
         -------
diff --git a/repo2docker/buildpacks/julia/semver.py b/repo2docker/semver.py
similarity index 86%
rename from repo2docker/buildpacks/julia/semver.py
rename to repo2docker/semver.py
index da9bf7c77..d0a2a5b86 100644
--- a/repo2docker/buildpacks/julia/semver.py
+++ b/repo2docker/semver.py
@@ -12,11 +12,13 @@
 
 
 import re
+from functools import lru_cache
 
 import semver
 
 
 def find_semver_match(constraint, versions_list):
+    """Find first version in a list of versions that matches a constraint"""
     matcher = create_semver_matcher(constraint)
     for vstr in reversed(versions_list):
         if matcher.match(str_to_version(vstr)):
@@ -25,9 +27,29 @@ def find_semver_match(constraint, versions_list):
 
 
 def str_to_version(vstr):
+    """Convert a simple x[.y[.z]] version string to a tuple of ints"""
     return tuple([int(n) for n in vstr.split(".")])
 
 
+@lru_cache()
+def parse_version(vstr):
+    """Convert a simple 'x[.y[.z]]' version string to a comparable VersionInfo
+
+    Wraps semver.VersionInfo.parse with zero-padding,
+    so it can accept '1.0', where upstream only accepts exactly 3 version fields.
+    """
+    try:
+        return semver.VersionInfo.parse(vstr)
+    except ValueError:
+        # may fail for e.g. short 1.0 versions
+        n_fields = vstr.count(".")
+        if n_fields < 2:
+            vstr = vstr + (".0" * (2 - n_fields))
+            return semver.VersionInfo.parse(vstr)
+        else:
+            raise
+
+
 # Helpers
 def major(v):
     return v[0]
@@ -41,6 +63,7 @@ def patch(v):
     return v[2] if len(v) >= 3 else 0
 
 
+@lru_cache()
 def create_semver_matcher(constraint_str):
     """Create a matcher that can be used to match version tuples
 
diff --git a/tests/conda/binder-dir/verify b/tests/conda/binder-dir/verify
index b5e017b35..46a533ba3 100755
--- a/tests/conda/binder-dir/verify
+++ b/tests/conda/binder-dir/verify
@@ -4,7 +4,18 @@ from subprocess import check_output
 
 assert sys.version_info[:2] == (3, 5), sys.version
 
-out = check_output(["conda", "--version"]).decode("utf8").strip()
-assert out == "conda 4.9.2", out
+out = check_output(["micromamba", "--version"]).decode("utf8").strip()
+assert (
+    out
+    == """micromamba: 0.19.1
+libmamba: 0.19.1"""
+), out
+
+out = check_output(["mamba", "--version"]).decode("utf8").strip()
+assert (
+    out
+    == """mamba 0.19.1
+conda 4.11.0"""
+), out
 
 import numpy
diff --git a/tests/conda/r/environment.yml b/tests/conda/r3.6/environment.yml
similarity index 65%
rename from tests/conda/r/environment.yml
rename to tests/conda/r3.6/environment.yml
index 29d84f12e..c1d2a2bee 100644
--- a/tests/conda/r/environment.yml
+++ b/tests/conda/r3.6/environment.yml
@@ -1,3 +1,3 @@
 dependencies:
   - r-base=3.6
-  - r-ggplot2
+  - r-testthat
diff --git a/tests/conda/r3.6/verify b/tests/conda/r3.6/verify
new file mode 100755
index 000000000..63a7165fd
--- /dev/null
+++ b/tests/conda/r3.6/verify
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+jupyter serverextension list 2>&1 | grep jupyter_server_proxy
+jupyter nbextension list 2>&1 | grep jupyter_server_proxy
+R -e "library('testthat')"
+# Fail if version is not 3.6
+R -e 'if (!(version$major == "3" && as.double(version$minor) >= 6 && as.double(version$minor) < 7)) quit("yes", 1)'
diff --git a/tests/conda/r4.0/environment.yml b/tests/conda/r4.0/environment.yml
new file mode 100644
index 000000000..2fb5e3480
--- /dev/null
+++ b/tests/conda/r4.0/environment.yml
@@ -0,0 +1,3 @@
+dependencies:
+  - r-base=4.0
+  - r-ggplot2
diff --git a/tests/conda/r/verify b/tests/conda/r4.0/verify
similarity index 52%
rename from tests/conda/r/verify
rename to tests/conda/r4.0/verify
index 5906028de..308dfa353 100755
--- a/tests/conda/r/verify
+++ b/tests/conda/r4.0/verify
@@ -3,3 +3,5 @@
 jupyter serverextension list 2>&1 | grep jupyter_server_proxy
 jupyter nbextension list 2>&1 | grep jupyter_server_proxy
 R -e "library('ggplot2')"
+# Fail if version is not 4.0
+R -e 'if (!(version$major == "4" && as.double(version$minor) >= 0 && as.double(version$minor) < 1)) quit("yes", 1)'
\ No newline at end of file
diff --git a/tests/conda/r4.1/environment.yml b/tests/conda/r4.1/environment.yml
new file mode 100644
index 000000000..479d4df78
--- /dev/null
+++ b/tests/conda/r4.1/environment.yml
@@ -0,0 +1,3 @@
+dependencies:
+  - r-base=4.1
+  - r-ggplot2
diff --git a/tests/conda/r4.1/verify b/tests/conda/r4.1/verify
new file mode 100755
index 000000000..d512316e4
--- /dev/null
+++ b/tests/conda/r4.1/verify
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+jupyter serverextension list 2>&1 | grep jupyter_server_proxy
+jupyter nbextension list 2>&1 | grep jupyter_server_proxy
+R -e "library('ggplot2')"
+# Fail if version is not 4.1
+R -e 'if (!(version$major == "4" && as.double(version$minor) >= 1 && as.double(version$minor) < 2)) quit("yes", 1)'
\ No newline at end of file
diff --git a/tests/conda/simple-py2/verify b/tests/conda/simple-py2/verify
index e6efc73b1..b251755a6 100755
--- a/tests/conda/simple-py2/verify
+++ b/tests/conda/simple-py2/verify
@@ -14,13 +14,13 @@ assert sorted(specs) == ["python2", "python3"], specs.keys()
 import json
 from subprocess import check_output
 
-envs = json.loads(check_output(["conda", "env", "list", "--json"]).decode("utf8"))
+envs = json.loads(check_output(["micromamba", "env", "list", "--json"]).decode("utf8"))
 assert envs == {
     "envs": ["/srv/conda", "/srv/conda/envs/kernel", "/srv/conda/envs/notebook"]
 }, envs
 
 pkgs = json.loads(
-    check_output(["conda", "list", "-n", "kernel", "--json"]).decode("utf8")
+    check_output(["micromamba", "list", "-n", "kernel", "--json"]).decode("utf8")
 )
 pkg_names = [pkg["name"] for pkg in pkgs]
 assert "ipykernel" in pkg_names, pkg_names
diff --git a/tests/dockerfile/binder-dir/binder/Dockerfile b/tests/dockerfile/binder-dir/binder/Dockerfile
index 989e2ec0a..492446360 100644
--- a/tests/dockerfile/binder-dir/binder/Dockerfile
+++ b/tests/dockerfile/binder-dir/binder/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.5
+FROM python:3.10
 
 RUN pip install --no-cache notebook
 
diff --git a/tests/dockerfile/simple/Dockerfile b/tests/dockerfile/simple/Dockerfile
index 989e2ec0a..492446360 100644
--- a/tests/dockerfile/simple/Dockerfile
+++ b/tests/dockerfile/simple/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.5
+FROM python:3.10
 
 RUN pip install --no-cache notebook
 
diff --git a/tests/pipfile/environment-yml/environment.yml b/tests/pipfile/environment-yml/environment.yml
index 13421ffc4..7482eae47 100644
--- a/tests/pipfile/environment-yml/environment.yml
+++ b/tests/pipfile/environment-yml/environment.yml
@@ -1,3 +1,4 @@
 dependencies:
+  - pip
   - pip:
       - pypi-pkg-test
diff --git a/tests/r/apt/apt.txt b/tests/r/apt/apt.txt
new file mode 100644
index 000000000..ede891d85
--- /dev/null
+++ b/tests/r/apt/apt.txt
@@ -0,0 +1 @@
+libsodium-dev
diff --git a/tests/r/apt/install.R b/tests/r/apt/install.R
new file mode 100644
index 000000000..8b43883c0
--- /dev/null
+++ b/tests/r/apt/install.R
@@ -0,0 +1 @@
+install.packages("viridisLite")
diff --git a/tests/r/apt/runtime.txt b/tests/r/apt/runtime.txt
new file mode 100644
index 000000000..a05a61215
--- /dev/null
+++ b/tests/r/apt/runtime.txt
@@ -0,0 +1 @@
+r-4.1-2021-10-22
diff --git a/tests/r/apt/verify b/tests/r/apt/verify
new file mode 100755
index 000000000..636a3374d
--- /dev/null
+++ b/tests/r/apt/verify
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+apt list
+apt list | grep libsodium-dev
+# make sure we got R
+which R
diff --git a/tests/r/mran/install.R b/tests/r/mran/install.R
new file mode 100644
index 000000000..b4fdeb90e
--- /dev/null
+++ b/tests/r/mran/install.R
@@ -0,0 +1 @@
+install.packages("testthat")
diff --git a/tests/r/mran/runtime.txt b/tests/r/mran/runtime.txt
new file mode 100644
index 000000000..308424ab2
--- /dev/null
+++ b/tests/r/mran/runtime.txt
@@ -0,0 +1 @@
+r-3.6-2016-01-03
diff --git a/tests/r/mran/verify b/tests/r/mran/verify
new file mode 100755
index 000000000..b15da1547
--- /dev/null
+++ b/tests/r/mran/verify
@@ -0,0 +1,9 @@
+#!/usr/bin/env Rscript
+library('testthat')
+
+print(version)
+
+# Fail if MRAN isn't the configured CRAN mirror
+if (!(startsWith(options()$repos["CRAN"], "https://mran.microsoft.com"))) {
+  quit("yes", 1)
+}
diff --git a/tests/r/r3.6/install.R b/tests/r/r3.6/install.R
new file mode 100644
index 000000000..b4fdeb90e
--- /dev/null
+++ b/tests/r/r3.6/install.R
@@ -0,0 +1 @@
+install.packages("testthat")
diff --git a/tests/r/r3.6/runtime.txt b/tests/r/r3.6/runtime.txt
new file mode 100644
index 000000000..50ebaa6a3
--- /dev/null
+++ b/tests/r/r3.6/runtime.txt
@@ -0,0 +1 @@
+r-3.6-2018-07-07
diff --git a/tests/r/r3.6/verify b/tests/r/r3.6/verify
new file mode 100755
index 000000000..42f33de32
--- /dev/null
+++ b/tests/r/r3.6/verify
@@ -0,0 +1,8 @@
+#!/usr/bin/env Rscript
+library('testthat')
+
+print(version)
+# Fail if version is not 3.6
+if (!(version$major == "3" && as.double(version$minor) >= 6 && as.double(version$minor) < 7)) {
+  quit("yes", 1)
+}
diff --git a/tests/r/r4.0-rspm/install.R b/tests/r/r4.0-rspm/install.R
new file mode 100644
index 000000000..b4fdeb90e
--- /dev/null
+++ b/tests/r/r4.0-rspm/install.R
@@ -0,0 +1 @@
+install.packages("testthat")
diff --git a/tests/r/r4.0-rspm/runtime.txt b/tests/r/r4.0-rspm/runtime.txt
new file mode 100644
index 000000000..e9f265b55
--- /dev/null
+++ b/tests/r/r4.0-rspm/runtime.txt
@@ -0,0 +1 @@
+r-4.0-2022-01-01
diff --git a/tests/r/r4.0-rspm/verify b/tests/r/r4.0-rspm/verify
new file mode 100755
index 000000000..091739e2c
--- /dev/null
+++ b/tests/r/r4.0-rspm/verify
@@ -0,0 +1,13 @@
+#!/usr/bin/env Rscript
+library('testthat')
+
+print(version)
+# Fail if version is not 4.0
+if (!(version$major == "4" && as.double(version$minor) >= 0 && as.double(version$minor) < 1)) {
+  quit("yes", 1)
+}
+
+# The date we have chosen should give us an rspm mirror
+if (!(startsWith(options()$repos["CRAN"], "https://packagemanager.rstudio.com"))) {
+  quit("yes", 1)
+}
\ No newline at end of file
diff --git a/tests/r/r4.0/install.R b/tests/r/r4.0/install.R
new file mode 100644
index 000000000..b4fdeb90e
--- /dev/null
+++ b/tests/r/r4.0/install.R
@@ -0,0 +1 @@
+install.packages("testthat")
diff --git a/tests/r/r4.0/runtime.txt b/tests/r/r4.0/runtime.txt
new file mode 100644
index 000000000..b051a4326
--- /dev/null
+++ b/tests/r/r4.0/runtime.txt
@@ -0,0 +1 @@
+r-4.0-2021-07-07
diff --git a/tests/r/r4.0/verify b/tests/r/r4.0/verify
new file mode 100755
index 000000000..d715cb38d
--- /dev/null
+++ b/tests/r/r4.0/verify
@@ -0,0 +1,13 @@
+#!/usr/bin/env Rscript
+library('testthat')
+
+print(version)
+# Fail if version is not 4.0
+if (!(version$major == "4" && as.double(version$minor) >= 0 && as.double(version$minor) < 1)) {
+  quit("yes", 1)
+}
+
+# The date we have chosen should give us an MRAN mirror
+if (!(startsWith(options()$repos["CRAN"], "https://mran.microsoft.com"))) {
+  quit("yes", 1)
+}
\ No newline at end of file
diff --git a/tests/r/r4.1/install.R b/tests/r/r4.1/install.R
new file mode 100644
index 000000000..b4fdeb90e
--- /dev/null
+++ b/tests/r/r4.1/install.R
@@ -0,0 +1 @@
+install.packages("testthat")
diff --git a/tests/r/r4.1/runtime.txt b/tests/r/r4.1/runtime.txt
new file mode 100644
index 000000000..a05a61215
--- /dev/null
+++ b/tests/r/r4.1/runtime.txt
@@ -0,0 +1 @@
+r-4.1-2021-10-22
diff --git a/tests/r/r4.1/verify b/tests/r/r4.1/verify
new file mode 100755
index 000000000..c390f2706
--- /dev/null
+++ b/tests/r/r4.1/verify
@@ -0,0 +1,12 @@
+#!/usr/bin/env Rscript
+library('testthat')
+
+# Fail if version is not 4.1
+if (!(version$major == "4" && as.double(version$minor) >= 1 && as.double(version$minor) < 2)) {
+  quit("yes", 1)
+}
+
+# R 4.1 always uses rspm snapshots
+if (!(startsWith(options()$repos["CRAN"], "https://packagemanager.rstudio.com"))) {
+  quit("yes", 1)
+}
diff --git a/tests/r/r4/install.R b/tests/r/r4/install.R
deleted file mode 100644
index df6d6a837..000000000
--- a/tests/r/r4/install.R
+++ /dev/null
@@ -1 +0,0 @@
-install.packages("ggplot2")
diff --git a/tests/r/r4/runtime.txt b/tests/r/r4/runtime.txt
deleted file mode 100644
index e0b263062..000000000
--- a/tests/r/r4/runtime.txt
+++ /dev/null
@@ -1 +0,0 @@
-r-4.0-2020-07-07
diff --git a/tests/r/r4/verify b/tests/r/r4/verify
deleted file mode 100755
index 6d28082b2..000000000
--- a/tests/r/r4/verify
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/usr/bin/env Rscript
-library('ggplot2')
-
-print(version)
-if (version$major != "4") {
-  quit("yes", 1)
-}
diff --git a/tests/r/simple/install.R b/tests/r/simple/install.R
index df6d6a837..b4fdeb90e 100644
--- a/tests/r/simple/install.R
+++ b/tests/r/simple/install.R
@@ -1 +1 @@
-install.packages("ggplot2")
+install.packages("testthat")
diff --git a/tests/r/simple/verify b/tests/r/simple/verify
index eec6690f2..1ccbaa970 100755
--- a/tests/r/simple/verify
+++ b/tests/r/simple/verify
@@ -1,2 +1,7 @@
 #!/usr/bin/env Rscript
-library('ggplot2')
+library('testthat')
+
+# Fail if version is not 4.1
+if (!(version$major == "4" && as.double(version$minor) >= 1 && as.double(version$minor) < 2)) {
+  quit("yes", 1)
+}
\ No newline at end of file
diff --git a/tests/unit/contentproviders/test_mercurial.py b/tests/unit/contentproviders/test_mercurial.py
index 25257bf39..4619ef862 100644
--- a/tests/unit/contentproviders/test_mercurial.py
+++ b/tests/unit/contentproviders/test_mercurial.py
@@ -1,15 +1,20 @@
-from pathlib import Path
+import os
 import subprocess
+from pathlib import Path
 from tempfile import TemporaryDirectory
-import os
-from distutils.util import strtobool
 
 import pytest
 
 from repo2docker.contentproviders import Mercurial
 from repo2docker.contentproviders.mercurial import args_enabling_topic
 
-SKIP_HG = strtobool(os.environ.get("REPO2DOCKER_SKIP_HG_TESTS", "False"))
+
+SKIP_HG = os.environ.get("REPO2DOCKER_SKIP_HG_TESTS", "").lower() not in {
+    "",
+    "0",
+    "false",
+    "no",
+}
 
 skip_if_no_hg_tests = pytest.mark.skipif(
     SKIP_HG,
diff --git a/tests/unit/test_r.py b/tests/unit/test_r.py
index dda984afd..f2c85041c 100644
--- a/tests/unit/test_r.py
+++ b/tests/unit/test_r.py
@@ -22,7 +22,7 @@ def test_unsupported_version(tmpdir):
 
 
 @pytest.mark.parametrize(
-    "runtime_version, expected", [("", "3.6"), ("3.6", "3.6"), ("3.5.1", "3.5")]
+    "runtime_version, expected", [("", "4.1"), ("3.6", "3.6"), ("3.5.1", "3.5")]
 )
 def test_version_specification(tmpdir, runtime_version, expected):
     tmpdir.chdir()
@@ -43,7 +43,7 @@ def test_version_completion(tmpdir):
         f.write(f"r-3.6-2019-01-01")
 
     r = buildpacks.RBuildPack()
-    assert r.r_version == "3.6.1-3bionic"
+    assert r.r_version == "3.6.3-1bionic"
 
 
 @pytest.mark.parametrize(
@@ -64,28 +64,46 @@ def test_mran_date(tmpdir, runtime, expected):
     assert r.checkpoint_date == date(*expected)
 
 
-@pytest.mark.parametrize("expected", ["2019-12-29", "2019-12-26"])
-def test_mran_latestdate(tmpdir, expected):
+def test_snapshot_rspm_date():
+    test_dates = {
+        # Even though there is no snapshot specified in the interface at https://packagemanager.rstudio.com/client/#/repos/1/overview
+        # For 2021 Oct 22, the API still returns a valid URL that one can install
+        # packages from - probably some server side magic that repeats our client side logic.
+        # No snapshot for this date from
+        date(2021, 10, 22): date(2021, 10, 22),
+        # Snapshot exists for this date
+        date(2022, 1, 1): date(2022, 1, 1),
+    }
+
+    r = buildpacks.RBuildPack()
+    for requested, expected in test_dates.items():
+        snapshot_url = r.get_rspm_snapshot_url(requested)
+        assert snapshot_url.startswith(
+            "https://packagemanager.rstudio.com/all/__linux__/bionic/"
+            + expected.strftime("%Y-%m-%d")
+        )
+
+    with pytest.raises(ValueError):
+        r.get_rspm_snapshot_url(date(1691, 9, 5))
+
+
+@pytest.mark.parametrize("expected", [date(2019, 12, 29), date(2019, 12, 26)])
+@pytest.mark.parametrize("requested", [date(2019, 12, 31)])
+def test_snapshot_mran_date(requested, expected):
     def mock_request_head(url):
         r = Response()
-        if url == "https://mran.microsoft.com/snapshot/" + expected:
+        if url == "https://mran.microsoft.com/snapshot/" + expected.isoformat():
             r.status_code = 200
         else:
             r.status_code = 404
             r.reason = "Mock MRAN no snapshot"
         return r
 
-    tmpdir.chdir()
-
-    with open("DESCRIPTION", "w") as f:
-        f.write("")
-
     with patch("requests.head", side_effect=mock_request_head):
-        with patch("datetime.date") as mockdate:
-            mockdate.today.return_value = date(2019, 12, 31)
-            r = buildpacks.RBuildPack()
-            r.detect()
-    assert r.checkpoint_date.isoformat() == expected
+        r = buildpacks.RBuildPack()
+        assert r.get_mran_snapshot_url(
+            requested
+        ) == "https://mran.microsoft.com/snapshot/{}".format(expected.isoformat())
 
 
 def test_install_from_base(tmpdir):
@@ -99,7 +117,7 @@ def test_install_from_base(tmpdir):
     assert "r-base" in r.get_packages()
 
 
-def test_install_from_ppa(tmpdir):
+def test_install_from_cran_apt_repo(tmpdir):
     # check that for R>3.4 we don't install r-base from Ubuntu
     tmpdir.chdir()
 
@@ -110,7 +128,7 @@ def test_install_from_ppa(tmpdir):
     assert "r-base" not in r.get_packages()
 
 
-def test_custom_ppa(tmpdir):
+def test_custom_cran_apt_repo(tmpdir):
     tmpdir.chdir()
 
     with open("runtime.txt", "w") as f:
@@ -120,16 +138,16 @@ def test_custom_ppa(tmpdir):
 
     scripts = r.get_build_scripts()
 
-    # check that at least one of the build scripts adds this new PPA
+    # check that at least one of the build scripts adds this new apt repository
     for user, script in scripts:
         if "https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/" in script:
             break
     else:
-        assert False, "Should have added a new PPA"
+        assert False, "Should have added a new apt repository"
 
     # check that we install the right package
     for user, script in scripts:
-        if "r-base=3.5" in script:
+        if "r-base-core=3.5" in script:
             break
     else:
         assert False, "Should have installed base R"
diff --git a/tests/unit/test_semver.py b/tests/unit/test_semver.py
index a91024637..bbbf8ca50 100644
--- a/tests/unit/test_semver.py
+++ b/tests/unit/test_semver.py
@@ -1,5 +1,6 @@
 import pytest
-from repo2docker.buildpacks.julia import semver
+from semver import VersionInfo
+from repo2docker import semver
 
 
 @pytest.mark.parametrize("test_input, expected", [("1.5.2", (1, 5, 2)), ("1", (1,))])
@@ -145,3 +146,20 @@ def test_largerthan_equal():
         semver.create_semver_matcher(">=1.2.3").match(semver.str_to_version("1.2.2"))
         == False
     )
+
+
+@pytest.mark.parametrize(
+    "vstr, expected",
+    [
+        ("1.2.3", "1.2.3"),
+        ("1.2", "1.2.0"),
+        ("1", "1.0.0"),
+    ],
+)
+def test_parse_version(vstr, expected):
+    version_info = semver.parse_version(vstr)
+    assert isinstance(version_info, semver.semver.VersionInfo)
+    assert str(version_info) == expected
+    # satisfies itself, since this is how we use it
+    assert semver.parse_version(expected) <= version_info
+    assert semver.parse_version(expected) >= version_info