diff --git a/ChangeLog.rst b/ChangeLog.rst
index e133be3c..c3216c82 100644
--- a/ChangeLog.rst
+++ b/ChangeLog.rst
@@ -1,6 +1,11 @@
 Changelog
 =========
 
+New in version 3.4.1
+--------------------
+* CAS operations will now raise ``MemcacheIllegalInputError`` when ``None`` is
+  given as the ``cas`` value.
+
 New in version 3.4.0
 --------------------
 * Added IPv6 support for TCP socket connections. Note that IPv6 may be used in
diff --git a/pymemcache/__init__.py b/pymemcache/__init__.py
index f55c637a..2713123c 100644
--- a/pymemcache/__init__.py
+++ b/pymemcache/__init__.py
@@ -1,4 +1,4 @@
-__version__ = '3.4.0'
+__version__ = '3.4.1'
 
 from pymemcache.client.base import Client  # noqa
 from pymemcache.client.base import PooledClient  # noqa