diff --git a/_pytest/__init__.py b/_pytest/__init__.py
index 9405eb038..684f25d27 100644
--- a/_pytest/__init__.py
+++ b/_pytest/__init__.py
@@ -1,2 +1,2 @@
 #
-__version__ = '2.3.0.dev1'
+__version__ = '2.3.1.dev1'
diff --git a/setup.py b/setup.py
index ecd0435cb..d5e0327b7 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ def main():
         name='pytest',
         description='py.test: simple powerful testing with Python',
         long_description = long_description,
-        version='2.3.0.dev1',
+        version='2.3.1.dev1',
         url='http://pytest.org',
         license='MIT license',
         platforms=['unix', 'linux', 'osx', 'cygwin', 'win32'],