diff --git a/config/ember-try.js b/config/ember-try.js
index 63d17eda..29eaf506 100644
--- a/config/ember-try.js
+++ b/config/ember-try.js
@@ -65,6 +65,7 @@ module.exports = async function () {
         npm: {
           devDependencies: {
             '@ember/jquery': '^1.1.0',
+            'ember-source': '~3.28.0',
           },
         },
       },