diff --git a/setup.py b/setup.py
index 526d69f..b5f4c1a 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@ from setuptools import find_packages
 from setuptools import setup
 
 
-version = '4.0.0a3'
+version = '4.0.0a4.dev0'
 
 install_requires = [
     'setuptools',