diff --git a/stack/erp5.cfg b/stack/erp5.cfg
index 53da23ca32b5e9485a2e746f2b55ef0202b76260..5e5fa77d0b99f194bbbe98c4ac555a2027e257e0 100644
--- a/stack/erp5.cfg
+++ b/stack/erp5.cfg
@@ -30,7 +30,7 @@ allow-hosts =
 
 extends =
 # Exact version of Zope
-  http://svn.zope.org/repos/main/Zope/tags/2.12.19/versions.cfg
+  http://svn.zope.org/repos/main/Zope/tags/2.12.20/versions.cfg
   ../component/logrotate/buildout.cfg
   ../component/dcron/buildout.cfg
   ../component/file/buildout.cfg