diff --git a/bower.json b/bower.json
index a0718d9..e1d720a 100644
--- a/bower.json
+++ b/bower.json
@@ -2,6 +2,7 @@
   "name": "core-tests",
   "private": true,
   "dependencies": {
-    "polymer-test-tools": "Polymer/polymer-test-tools#master"
-  }
-}
+    "polymer-test-tools": "Polymer/polymer-test-tools#^0.5.0"
+  },
+  "version": "0.5.1"
+}
\ No newline at end of file