diff --git a/bower.json b/bower.json
index 7368acd..e72157b 100644
--- a/bower.json
+++ b/bower.json
@@ -2,6 +2,6 @@
   "name": "core-header-panel",
   "private": true,
   "dependencies": {
-    "polymer": "Polymer/polymer#master"
+    "polymer": "Polymer/polymer#^0.4.0"
   }
 }
\ No newline at end of file