diff --git a/README.rst b/README.rst
index b59456531..aef7aae2b 100644
--- a/README.rst
+++ b/README.rst
@@ -121,6 +121,7 @@ Before building on Linux systems you must install the following packages:
 .. code-block :: bash
 
   sudo apt-get install build-essential libgl1-mesa-dev libxt-dev
+  sudo apt-get libx11-xcb-dev libxcb1-dev libxcb-glx0-dev libxkbcommon-x11-dev
   sudo apt-get install libexpat1-dev libgtk2.0-dev liblapack-dev
 
 On Linux, to optionally build with Python and to build the user documentation,
@@ -128,7 +129,7 @@ you will also need to install the following:
 
 .. code-block :: bash
 
-  sudo apt-get install python3-dev python3-sphinx-rtd-theme
+  sudo apt-get install python3-dev python3-sphinx python3-sphinx-rtd-theme
 
 Set up the folder structure and obtain the source files. This can be done with
 git or by downloading the files and extracting them. Then setup the folder(s)
diff --git a/packaging/Dockerfile b/packaging/Dockerfile
index bae16a0e0..f77cb910b 100644
--- a/packaging/Dockerfile
+++ b/packaging/Dockerfile
@@ -15,13 +15,22 @@ ARG branch=release
 
 # Install required system packages to build TeleSculptor
 # Everything else is built from Fletch
-RUN apt-get update && apt-get install -y --no-install-recommends \
-build-essential file git cmake \
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive \
+apt-get install -y --no-install-recommends \
+build-essential file git \
 wget automake \
 libgl1-mesa-dev libxt-dev libexpat1-dev libgtk2.0-dev liblapack-dev \
-python3-dev python3-docutils && \
+libx11-xcb-dev libxcb1-dev libxcb-glx0-dev libxkbcommon-x11-dev \
+python3-dev python3-sphinx python3-sphinx-rtd-theme && \
 rm -rf /var/lib/apt/lists/*
 
+# Install CMake 3.15
+RUN wget --no-check-certificate \
+https://github.com/Kitware/CMake/releases/download/v3.15.1/cmake-3.15.1-Linux-x86_64.sh \
+&& chmod +x cmake-3.15.1-Linux-x86_64.sh \
+&& ./cmake-3.15.1-Linux-x86_64.sh --skip-license \
+&& rm -rf cmake-3.15.1-Linux-x86_64.sh
+
 # Set Python3 as the default
 # Make sure `python` is available and calls `python3`
 # Some build steps fail without `python` available