diff --git a/polymorphic/__version__.py b/polymorphic/__version__.py
index ce1350f..88ac3bd 100644
--- a/polymorphic/__version__.py
+++ b/polymorphic/__version__.py
@@ -11,5 +11,4 @@ Release logic:
     6. git commit
     7. push to github
 """
-__version__ = "0.4.2"
-
+__version__ = "0.4.2.dev0"
diff --git a/setup.py b/setup.py
index b41f2a8..887ce33 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@ from setuptools import setup, find_packages
 
 setup(
     name = 'django_polymorphic',
-    version ="0.4.2",  # You must ALSO bump polymorphic.__version__ !
+    version ="0.4.2.dev0",  # You must ALSO bump polymorphic.__version__ !
     description = 'Seamless Polymorphic Inheritance for Django Models',
     url = 'https://github.com/chrisglass/django_polymorphic',