diff --git a/setup.py b/setup.py
index 828ef72..0586363 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@ else:
 
 setup(
     name='isso',
-    version='0.5.2',
+    version='0.5.3.dev0',
     author='Martin Zimmermann',
     author_email='info@posativ.org',
     packages=find_packages(),