diff --git a/.ci/version.txt b/.ci/version.txt
index 483f8c1b61..f70210f0b8 100644
--- a/.ci/version.txt
+++ b/.ci/version.txt
@@ -1,5 +1,5 @@
 1.26.0
 rc
-3
+4
 
-be9e2dcfc5c563075a944aeecda2c75cb55300c9ac5f80b61e87181ee4d801f5
\ No newline at end of file
+a2af8b6ed41822a83fec76d2f8b69ffc793664b56ef2944bc79f8136d330580d
\ No newline at end of file
diff --git a/api/dotnet/src/Indigo.Net.csproj b/api/dotnet/src/Indigo.Net.csproj
index 40abff3c2b..e9c931ddfd 100644
--- a/api/dotnet/src/Indigo.Net.csproj
+++ b/api/dotnet/src/Indigo.Net.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<TargetFrameworks>netstandard2.0</TargetFrameworks>
-		<Version>1.26.0-rc.3</Version>
+		<Version>1.26.0-rc.4</Version>
 		<Authors>EPAM Systems Life Science Department</Authors>
 		<Company>EPAM Systems</Company>
 		<Description>Universal cheminformatics toolkit</Description>
diff --git a/api/http/requirements.txt b/api/http/requirements.txt
index cda80cb7e6..afb6b96196 100644
--- a/api/http/requirements.txt
+++ b/api/http/requirements.txt
@@ -1,7 +1,7 @@
 anyio==3.7.0
 asgiref==3.7.1
 click==8.1.3
-epam.indigo==1.26.0.rc3
+epam.indigo==1.26.0.rc4
 fastapi==0.95.2
 h11==0.14.0
 idna==3.4
diff --git a/api/http/setup.py b/api/http/setup.py
index 19eb1596cc..0fb8943d07 100644
--- a/api/http/setup.py
+++ b/api/http/setup.py
@@ -20,7 +20,7 @@
 
 setup_kwargs = {
     "name": "indigo-service",
-    "version": "1.26.0.rc3",
+    "version": "1.26.0.rc4",
     "description": "",
     "long_description": None,
     "author": "Ruslan Khyurri",
diff --git a/api/indigo-version.cmake b/api/indigo-version.cmake
index 03dd9ddd08..5292ebe88a 100644
--- a/api/indigo-version.cmake
+++ b/api/indigo-version.cmake
@@ -1,4 +1,4 @@
-set(INDIGO_DEFAULT_VERSION "1.26.0-rc.3")
+set(INDIGO_DEFAULT_VERSION "1.26.0-rc.4")
 set(INDIGO_MAX_REVISION 1000)
 find_package(Git)
 if(GIT_EXECUTABLE)
diff --git a/api/java/pom.xml b/api/java/pom.xml
index 71c6336ba1..11e84bc89b 100644
--- a/api/java/pom.xml
+++ b/api/java/pom.xml
@@ -17,7 +17,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>${maven.compiler.source}</maven.compiler.target>
-        <revision>1.26.0-rc.3</revision>
+        <revision>1.26.0-rc.4</revision>
     </properties>
 
     <licenses>
diff --git a/api/python/indigo/__init__.py b/api/python/indigo/__init__.py
index 403b690f33..15539854e8 100644
--- a/api/python/indigo/__init__.py
+++ b/api/python/indigo/__init__.py
@@ -3,4 +3,4 @@
 from .indigo.indigo_exception import IndigoException  # noqa
 from .indigo.indigo_object import IndigoObject  # noqa
 
-__version__ = "1.26.0.rc3"
+__version__ = "1.26.0.rc4"
diff --git a/api/python/setup.py b/api/python/setup.py
index 98ff169530..60798f423e 100644
--- a/api/python/setup.py
+++ b/api/python/setup.py
@@ -98,7 +98,7 @@
 
 setup(
     name="epam.indigo",
-    version="1.26.0.rc3",
+    version="1.26.0.rc4",
     description="Indigo universal cheminformatics toolkit",
     author="EPAM Systems Life Science Department",
     author_email="lifescience.opensource@epam.com",
diff --git a/api/r/DESCRIPTION b/api/r/DESCRIPTION
index bb56a61c77..e2c4ae41d4 100644
--- a/api/r/DESCRIPTION
+++ b/api/r/DESCRIPTION
@@ -1,5 +1,5 @@
 Package: rindigo
-Version: 1.26.0-rc.3
+Version: 1.26.0-rc.4
 Date: 2020-12-10
 Title: R Package for Indigo Toolkit
 Authors@R: c(person(given = "Mikhail", family = "Kviatkovskii", role = c("cre"),
diff --git a/api/wasm/indigo-ketcher/package.json b/api/wasm/indigo-ketcher/package.json
index 61682e03e8..7c492b8379 100644
--- a/api/wasm/indigo-ketcher/package.json
+++ b/api/wasm/indigo-ketcher/package.json
@@ -1,6 +1,6 @@
 {
   "name": "indigo-ketcher",
-  "version": "1.26.0-rc.3-2",
+  "version": "1.26.0-rc.4-2",
   "description": "WASM implementation of Indigo organic chemistry toolkit web service for Ketcher",
   "exports": {
     ".": {
diff --git a/bingo/bingo-elastic/java/pom.xml b/bingo/bingo-elastic/java/pom.xml
index d02aa413d5..6953fa20d6 100644
--- a/bingo/bingo-elastic/java/pom.xml
+++ b/bingo/bingo-elastic/java/pom.xml
@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.epam.indigo</groupId>
     <artifactId>bingo-elastic</artifactId>
-    <version>1.26.0-rc.3</version>
+    <version>1.26.0-rc.4</version>
     <packaging>jar</packaging>
 
     <name>Bingo Elastic</name>
diff --git a/bingo/bingo-elastic/python/bingo_elastic/__init__.py b/bingo/bingo-elastic/python/bingo_elastic/__init__.py
index 6fb1befef0..d7586ffcf3 100644
--- a/bingo/bingo-elastic/python/bingo_elastic/__init__.py
+++ b/bingo/bingo-elastic/python/bingo_elastic/__init__.py
@@ -1 +1 @@
-__version__ = "1.26.0.rc3"
+__version__ = "1.26.0.rc4"
diff --git a/bingo/bingo-elastic/python/setup.py b/bingo/bingo-elastic/python/setup.py
index 95b2b53119..4c5a7f20cb 100644
--- a/bingo/bingo-elastic/python/setup.py
+++ b/bingo/bingo-elastic/python/setup.py
@@ -21,7 +21,7 @@
 
 setup(
     name="bingo_elastic",
-    version="1.26.0.rc3",
+    version="1.26.0.rc4",
     description="Cartridge that provides fast, scalable, and efficient storage and searching solution for chemical information using Elasticsearch",
     author="Ruslan Khyurri",
     author_email="ruslan_khyurri@epam.com",
@@ -35,7 +35,7 @@
     download_url="https://pypi.org/project/bingo_elastic",
     python_requires=">=3.7",
     packages=["bingo_elastic", "bingo_elastic.model"],
-    install_requires=["epam.indigo==1.26.0.rc3", "elasticsearch==7.16.2"],
+    install_requires=["epam.indigo==1.26.0.rc4", "elasticsearch==7.16.2"],
     extras_require={
         "async": ["elasticsearch[async]==7.16.2"],
         "dev": [
diff --git a/utils/indigo-ml/setup.py b/utils/indigo-ml/setup.py
index f77131b723..4f16622f75 100644
--- a/utils/indigo-ml/setup.py
+++ b/utils/indigo-ml/setup.py
@@ -95,7 +95,7 @@
 
 setup(
     name="epam.indigo",
-    version="1.26.0.rc3",
+    version="1.26.0.rc4",
     description="Indigo universal cheminformatics toolkit",
     author="EPAM Systems Life Science Department",
     author_email="lifescience.opensource@epam.com",