diff --git a/CHANGELOG b/CHANGELOG
index 79ab98a8c..00578fe4d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,10 @@
 
 http://openslides.org
 
+Version 1.5.2 (unreleased)
+==========================
+
+
 Version 1.5.1 (2014-03-31)
 ==========================
 [https://github.com/OpenSlides/OpenSlides/issues?milestone=15]
diff --git a/openslides/__init__.py b/openslides/__init__.py
index 2157b9ed7..9f16d9bf6 100644
--- a/openslides/__init__.py
+++ b/openslides/__init__.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 
-VERSION = (1, 5, 1, 'final', 1)  # During development it is the next release
-RELEASE = True
+VERSION = (1, 5, 2, 'final', 1)  # During development it is the next release
+RELEASE = False
 
 
 def get_version(version=None, release=None):