diff --git a/CHANGES.rst b/CHANGES.rst
index 57587cd..5078c99 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,6 +1,12 @@
 Changelog for Isso
 ==================
 
+0.4 (unreleased)
+----------------
+
+- Nothing changed yet.
+
+
 0.3 (2013-11-01)
 ----------------
 
diff --git a/setup.py b/setup.py
index b4be1ff..fbfa31f 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ if sys.version_info < (3, 0):
 
 setup(
     name='isso',
-    version='0.3',
+    version='0.4.dev0',
     author='Martin Zimmermann',
     author_email='info@posativ.org',
     packages=find_packages(),