diff --git a/CHANGES.rst b/CHANGES.rst
index db7bc1b..bceb773 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changes
 =======
 
+0.5.0 - 2021-09-04
+------------------
+
+* fix Docutils error
+* adapt to Sphinx 4
+
 0.4.0 - 2021-01-02
 ------------------
 
diff --git a/jandd/sphinxext/ip.py b/jandd/sphinxext/ip.py
index 0d3bfd9..03c7bf3 100644
--- a/jandd/sphinxext/ip.py
+++ b/jandd/sphinxext/ip.py
@@ -8,7 +8,7 @@
     :copyright: Copyright (c) 2016-2021 Jan Dittberner
     :license: GPLv3+, see COPYING file for details.
 """
-__version__ = "0.5.0-dev"
+__version__ = "0.5.0"
 
 from collections import defaultdict
 from typing import Iterable, List, Optional, Tuple
diff --git a/setup.cfg b/setup.cfg
index d98c873..1a8206d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,6 +17,7 @@ keywords = sphinx, extension, IP
 license = GPLv3+
 license_file = COPYING
 platforms = any
+version = 0.5.0
 classifiers =
    Development Status :: 5 - Production/Stable
    Framework :: Sphinx :: Extension