diff --git a/Lib/version.py b/Lib/version.py
index 2d07dcbad0e0..0e9f3d738b9d 100644
--- a/Lib/version.py
+++ b/Lib/version.py
@@ -1,5 +1,5 @@
-version = '0.5.2'
-release=True
+version = '0.5.2.1'
+release=False
 
 if not release:
     import os