diff --git a/CHANGES.rst b/CHANGES.rst
index 5121491..164cca6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+1.6.4 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 1.6.3 (2015-09-20)
 ------------------
 
diff --git a/setup.py b/setup.py
index 63aa84b..8a02e26 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-version = '1.6.3'
+version = '1.6.4.dev0'
 
 setup(name='Products.CMFPlacefulWorkflow',
       version=version,