diff --git a/CHANGES.rst b/CHANGES.rst
index b699b6a..24d43b6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -19,8 +19,8 @@ Release History
    - Removed
    - Fixed
 
-20.5 (unreleased)
-=================
+20.9 (September 9, 2020)
+========================
 
 **Added**
 
diff --git a/nengo_sphinx_theme/version.py b/nengo_sphinx_theme/version.py
index fd9d632..3f4ed5f 100644
--- a/nengo_sphinx_theme/version.py
+++ b/nengo_sphinx_theme/version.py
@@ -11,7 +11,7 @@
 name = "nengo_sphinx_theme"
 today = date.today()
 version_info = (today.year - 2000, today.month)
-dev = 0
+dev = None
 
 version = "{v}{dev}".format(
     v=".".join(str(v) for v in version_info),