diff --git a/CHANGES b/CHANGES
index 0176e6687..75a9ab0db 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,13 @@
+Release 5.2.1 (released Sep 24, 2022)
+=====================================
+
+Bugs fixed
+----------
+
+* #10861: Always normalise the ``pycon3`` lexer to ``pycon``.
+* Fix using ``sphinx.ext.autosummary`` with modules containing titles in the
+  module-level docstring.
+
 Release 5.2.0.post0 (released Sep 24, 2022)
 ===========================================
 
diff --git a/sphinx/__init__.py b/sphinx/__init__.py
index 4a7472804..9cdb8f742 100644
--- a/sphinx/__init__.py
+++ b/sphinx/__init__.py
@@ -19,7 +19,7 @@ warnings.filterwarnings('ignore', "'U' mode is deprecated",
 warnings.filterwarnings('ignore', 'The frontend.Option class .*',
                         DeprecationWarning, module='docutils.frontend')
 
-__version__ = '5.2.0.post0'
+__version__ = '5.2.1'
 __display_version__ = __version__  # used for command line version
 
 #: Version info for better programmatic use.
@@ -30,7 +30,7 @@ __display_version__ = __version__  # used for command line version
 #:
 #: .. versionadded:: 1.2
 #:    Before version 1.2, check the string ``sphinx.__version__``.
-version_info = (5, 2, 0, 'final', 1)
+version_info = (5, 2, 1, 'final', 0)
 
 package_dir = path.abspath(path.dirname(__file__))