diff --git a/setup.py b/setup.py
index 524b232..33a745f 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 from setuptools import setup
 
 
-version = "4.0.0b3"
+version = "4.0.0b4.dev0"
 with open("README.rst") as myfile:
     readme = myfile.read()
 with open("CHANGES.rst") as myfile: