diff --git a/service/files/defaults.yaml b/service/files/defaults.yaml
index a6cd5e2..4d20b10 100644
--- a/service/files/defaults.yaml
+++ b/service/files/defaults.yaml
@@ -14,4 +14,4 @@ configs:
 sources:
   openstack/nova:
     git_url: https://github.com/openstack/nova.git
-    git_ref: master
+    git_ref: stable/newton