diff --git a/py/__init__.py b/py/__init__.py
index 430c0562c..32fa85b41 100644
--- a/py/__init__.py
+++ b/py/__init__.py
@@ -8,7 +8,7 @@ dictionary or an import path.
 
 (c) Holger Krekel and others, 2004-2010
 """
-__version__ = version = "1.3.3"
+__version__ = version = "1.3.4a1"
 
 import py.apipkg
 
diff --git a/setup.py b/setup.py
index 9c6758412..cf93eeb6a 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@ def main():
         name='py',
         description='py.test and pylib: rapid testing and development utils.',
         long_description = long_description,
-        version= '1.3.3',
+        version= '1.3.4a1',
         url='http://pylib.org',
         license='MIT license',
         platforms=['unix', 'linux', 'osx', 'cygwin', 'win32'],