diff --git a/CHANGES.md b/CHANGES.md
index 6d7de6c5..3de595bc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,10 @@
 # pyfakefs Release Notes
 The released versions correspond to PyPi releases.
 
-## Version 4.4.0 (as yet unreleased)
+## [Version 4.3.1](https://pypi.python.org/pypi/pyfakefs/4.3.1) (2020-11-23)
+
+This is an update to the performance release, with more setup caching and the
+possibility to disable it. 
 
 ### Changes
 * Added caching of patched modules to avoid lookup overhead  
diff --git a/docs/conf.py b/docs/conf.py
index 8ca04571..660f34d2 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -66,9 +66,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '4.4'
+version = '4.3.1'
 # The full version, including alpha/beta/rc tags.
-release = '4.4dev'
+release = '4.3.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pyfakefs/_version.py b/pyfakefs/_version.py
index 50256ed7..376d9ccc 100644
--- a/pyfakefs/_version.py
+++ b/pyfakefs/_version.py
@@ -1 +1 @@
-__version__ = '4.4dev'
+__version__ = '4.3.1'
diff --git a/setup.py b/setup.py
index 846c8811..f346fd9e 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@
     'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: 3.9',
     'Programming Language :: Python :: Implementation :: CPython',
     'Programming Language :: Python :: Implementation :: PyPy',
     'Operating System :: POSIX',