diff --git a/config/ember-try.js b/config/ember-try.js
index 7b8d8fd..a834350 100644
--- a/config/ember-try.js
+++ b/config/ember-try.js
@@ -13,7 +13,8 @@ module.exports = {
       },
       npm: {
         devDependencies: {
-          'ember-source': null
+          'ember-source': null,
+          'ember-hash-helper-polyfill': '^0.2.1',
         }
       }
     },