diff --git a/CHANGES.rst b/CHANGES.rst
index 726d5cc..7391b95 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog for Isso
 ==================
 
+0.5 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 0.4 (2013-11-05)
 ----------------
 
diff --git a/setup.py b/setup.py
index 30f2b14..63082b0 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ else:
 
 setup(
     name='isso',
-    version='0.4',
+    version='0.5.dev0',
     author='Martin Zimmermann',
     author_email='info@posativ.org',
     packages=find_packages(),