diff --git a/versions-prod.cfg b/versions-prod.cfg
index c0216cb708..a25bf8b528 100644
--- a/versions-prod.cfg
+++ b/versions-prod.cfg
@@ -88,4 +88,4 @@ zope.testing = 4.6.2
 zope.testrunner = 4.7.0
 zope.traversing = 4.1.0
 zope.viewlet = 4.0.0
-ZServer = 4.0a2
+ZServer = 4.0b1