diff --git a/buildout.cfg b/buildout.cfg
index fc944da..7f6440d 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -1,6 +1,6 @@
 [buildout]
 extends =
-  https://raw.githubusercontent.com/zopefoundation/groktoolkit/master/grok.cfg
+  https://raw.githubusercontent.com/zopefoundation/groktoolkit/3.0.0a1/grok.cfg
 develop = .
 parts =
   coverage