diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6224d53..c25114ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,14 @@ for the source-code artifacts of each version.
 
 ## Pynguin 0.21.0
 
+- Fix a bug in the module analysis regarding nested functions
+
+  Nested functions/closures caused Pynguin's module analysis to crash with an 
+  failing assertion.
+- Improve the branch-distance computation for `bool` values
+- Allow for more statistics variables regarding number of lines and cyclomatic 
+  complexity
+
 ## Pynguin 0.20.1
 
 - Fix a bug in terminating Pynguin due to threading
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 43bf5b19..eeb70dd1 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -36,7 +36,7 @@ FROM python:3.10.4-slim-bullseye AS execute
 
 # Set environment variables
 # Set the Pynguin version
-ENV PYNGUIN_VERSION "0.21.0.dev0"
+ENV PYNGUIN_VERSION "0.21.0"
 # Pynguin requires to set the variable to show it that the user is aware that running
 # Pynguin executes third-party code, which could cause arbitrary harm to the system.
 # By setting the variable, the user acknowledges that they are aware of this.  In the
diff --git a/pynguin/__init__.py b/pynguin/__init__.py
index 009c15d0..74a757c0 100644
--- a/pynguin/__init__.py
+++ b/pynguin/__init__.py
@@ -16,7 +16,7 @@
 StatisticsBackend = config.StatisticsBackend
 TypeInferenceStrategy = config.TypeInferenceStrategy
 
-__version__ = "0.21.0.dev"
+__version__ = "0.21.0"
 __all__ = [
     "set_configuration",
     "run_pynguin",
diff --git a/pyproject.toml b/pyproject.toml
index 93ed8c95..3ec5951c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@
 
 [tool.poetry]
 name = "pynguin"
-version = "0.21.0.dev"
+version = "0.21.0"
 description = "Pynguin is a tool for automated unit test generation for Python"
 authors = ["Stephan Lukasczyk <stephan@lukasczyk.me>"]
 license = "LGPL-3.0-or-later"