diff --git a/project.config b/project.config
index ff26f26..983100d 100644
--- a/project.config
+++ b/project.config
@@ -120,5 +120,7 @@
 	forgeAuthor = group ldap/OSM_Admin
 	forgeCommitter = group ldap/OSM_Admin
 	rebase = group ldap/OSM_Leader
+[access "refs/heads/master"]
+	push = deny group ldap/OSM_Contributor
 [plugin "its-bugzilla"]
 	enabled = true