diff --git a/bower.json b/bower.json
index afee3e2974..1181b64c18 100644
--- a/bower.json
+++ b/bower.json
@@ -21,8 +21,8 @@
     "url": "https://github.com/Polymer/polymer.git"
   },
   "dependencies": {
-    "shadycss": "webcomponents/shadycss#v1.0.0-rc.1",
-    "webcomponentsjs": "v1.0.0-rc.5"
+    "shadycss": "webcomponents/shadycss#^v1.0.0-rc.1",
+    "webcomponentsjs": "^v1.0.0-rc.5"
   },
   "devDependencies": {
     "web-component-tester": "^5",