diff --git a/CHANGES.rst b/CHANGES.rst
index bceb773..f535366 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,11 @@
 Changes
 =======
 
+0.5.1 - 2021-09-04
+------------------
+
+* fix anchors in links
+
 0.5.0 - 2021-09-04
 ------------------
 
diff --git a/jandd/sphinxext/ip.py b/jandd/sphinxext/ip.py
index 4e527b5..856daf8 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"
+__version__ = "0.5.1"
 
 from collections import defaultdict
 from typing import Iterable, List, Optional, Tuple
diff --git a/setup.cfg b/setup.cfg
index 1a8206d..cbd92d8 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -17,7 +17,7 @@ keywords = sphinx, extension, IP
 license = GPLv3+
 license_file = COPYING
 platforms = any
-version = 0.5.0
+version = 0.5.1
 classifiers =
    Development Status :: 5 - Production/Stable
    Framework :: Sphinx :: Extension
diff --git a/tests/root/conf.py b/tests/root/conf.py
index 7f8b00e..c04743a 100644
--- a/tests/root/conf.py
+++ b/tests/root/conf.py
@@ -55,9 +55,9 @@ author = "Jan Dittberner"
 # built documents.
 #
 # The short X.Y version.
-version = "0.5.0"
+version = "0.5.1"
 # The full version, including alpha/beta/rc tags.
-release = version + "-dev"
+release = version
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.