diff --git a/test-packages/basic-app/package.json b/test-packages/basic-app/package.json
index 21484a156..47babe73a 100644
--- a/test-packages/basic-app/package.json
+++ b/test-packages/basic-app/package.json
@@ -51,7 +51,7 @@
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-qunit": "^4.6.0",
     "ember-resolver": "^8.0.0",
-    "ember-source": "~3.19.0",
+    "ember-source": "~3.28.6",
     "ember-template-lint": "^2.8.0",
     "eslint": "^7.1.0",
     "eslint-plugin-ember": "^8.6.0",