diff --git a/CHANGES.txt b/CHANGES.txt
index 32fcb7664c379d765a6f54c45f2fb2795ae14549..ab2686bc605a92163ef9ac067b7767899cdd6d02 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,6 +1,11 @@
 Changes
 =======
 
+0.51 (Unreleased)
+-----------------
+
+  * No change yet.
+
 0.50 (2012-05-12)
 -----------------
 
diff --git a/setup.py b/setup.py
index f2fe896d6b802885e07116732444031ef574419e..211ee261ccc7838b7b08bc1145d1824ac6e9867f 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 import glob
 import os
 
-version = '0.50'
+version = '0.51-dev'
 name = 'slapos.cookbook'
 long_description = open("README.txt").read() + "\n" + \
     open("CHANGES.txt").read() + "\n"