diff --git a/bower.json b/bower.json
index 1e4899c..04320de 100644
--- a/bower.json
+++ b/bower.json
@@ -2,7 +2,7 @@
   "name": "core-selector",
   "private": true,
   "dependencies": {
-    "polymer": "Polymer/polymer#master",
-    "core-selection": "Polymer/core-selection#master"
+    "polymer": "Polymer/polymer#>=0.4.0 <1.0.0",
+    "core-selection": "Polymer/core-selection#>=0.4.0 <1.0.0"
   }
 }
\ No newline at end of file