diff --git a/CHANGES.rst b/CHANGES.rst
index 4be6604dd..f1529e79b 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,3 +1,11 @@
+Changes in synapse v0.23.1 (2017-10-02)
+=======================================
+
+Changes:
+
+* Make 'affinity' package optional, as it is not supported on some platforms
+
+
 Changes in synapse v0.23.0 (2017-10-02)
 =======================================
 
diff --git a/synapse/__init__.py b/synapse/__init__.py
index 97d6c4094..bee4aba62 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -16,4 +16,4 @@
 """ This is a reference implementation of a Matrix home server.
 """
 
-__version__ = "0.23.0"
+__version__ = "0.23.1"