diff --git a/bower.json b/bower.json
index 91b46a0..3c04ded 100644
--- a/bower.json
+++ b/bower.json
@@ -2,9 +2,9 @@
   "name": "core-scaffold",
   "private": true,
   "dependencies": {
-    "core-drawer-panel": "Polymer/core-drawer-panel#master",
-    "core-header-panel": "Polymer/core-header-panel#master",
-    "core-icon-button": "Polymer/core-icon-button#master",
-    "core-toolbar": "Polymer/core-toolbar#master"
+    "core-drawer-panel": "Polymer/core-drawer-panel#>=0.3.0 <1.0.0",
+    "core-header-panel": "Polymer/core-header-panel#>=0.3.0 <1.0.0",
+    "core-icon-button": "Polymer/core-icon-button#>=0.3.0 <1.0.0",
+    "core-toolbar": "Polymer/core-toolbar#>=0.3.0 <1.0.0"
   }
-}
+}
\ No newline at end of file