diff --git a/src/sage/version.py b/src/sage/version.py
index 6851db7b932..380780468e6 100644
--- a/src/sage/version.py
+++ b/src/sage/version.py
@@ -1,2 +1,2 @@
 """nodoctests"""
-version='4.2.1.alpha0'; date='2009-11-09'
+version='4.2.1.rc0'; date='2009-11-12'