diff --git a/xos/synchronizer/config.yaml b/xos/synchronizer/config.yaml
index df56433..ad6e7e2 100644
--- a/xos/synchronizer/config.yaml
+++ b/xos/synchronizer/config.yaml
@@ -15,6 +15,7 @@
 
 
 name: vrouter
+core_version: ">=2.2.1"
 required_models:
   - VRouterService
   - VRouterServiceInstance