diff --git a/docs/changelog.rst b/docs/changelog.rst
index 62e8362e..c0ce8384 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -18,8 +18,8 @@ To avail of fixes in an unreleased version, please download a ZIP file
 `directly from GitHub <https://github.com/mitogen-hq/mitogen/>`_.
 
 
-In progress (unreleased)
-------------------------
+v0.3.21 (2025-01-20)
+--------------------
 
 * :gh:issue:`1209` docs: Fix Netlify build of website
 * :gh:issue:`1216` :mod:`ansible_mitogen`: Add all ansible_freeipa modules to
diff --git a/mitogen/__init__.py b/mitogen/__init__.py
index 0a34c21b..bbf807dc 100644
--- a/mitogen/__init__.py
+++ b/mitogen/__init__.py
@@ -35,7 +35,7 @@ be expected. On the slave, it is built dynamically during startup.
 
 
 #: Library version as a tuple.
-__version__ = (0, 3, 21, 'dev')
+__version__ = (0, 3, 21)
 
 
 #: This is :data:`False` in slave contexts. Previously it was used to prevent