diff --git a/setup.py b/setup.py
index e5c8b57..9b5375e 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ from setuptools import find_packages
 from setuptools import setup
 
 
-version = '4.0.0a5'
+version = '4.0.0a6.dev0'
 
 install_requires = [
     'setuptools',