diff --git a/bower.json b/bower.json
index 8d273260b9..1d2f18711a 100644
--- a/bower.json
+++ b/bower.json
@@ -2,7 +2,7 @@
   "name": "polymer",
   "private": true,
   "dependencies": {
-    "platform": "Polymer/platform#master",
-    "core-component-page": "Polymer/core-component-page#master"
+    "platform": "Polymer/platform#^0.4.0",
+    "core-component-page": "Polymer/core-component-page#^0.4.0"
   }
-}
+}
\ No newline at end of file