diff --git a/dev/buildout.cfg b/dev/buildout.cfg
index 5542f81..f3a0b27 100644
--- a/dev/buildout.cfg
+++ b/dev/buildout.cfg
@@ -4,7 +4,7 @@ unzip = true
 parts = instance omelette zopepy test roadrunner
 extends =
     http://dist.plone.org/release/3.3.4/versions.cfg
-    http://good-py.appspot.com/release/plone.app.discussion/1.0a2
+    http://good-py.appspot.com/release/plone.app.discussion/1.0b4
 versions = versions
 sources = sources