diff --git a/Mac/_checkversion.py b/Mac/_checkversion.py
index ee018574190..264723c3cfb 100644
--- a/Mac/_checkversion.py
+++ b/Mac/_checkversion.py
@@ -5,7 +5,7 @@
 import pyversioncheck
 
 _PACKAGE="MacPython"
-_VERSION="1.5.2b1"
+_VERSION="1.5.2c1"
 _URL="http://www.cwi.nl/~jack/macpythonversion.txt"
 
 try: