diff --git a/railties/test/isolation/assets/package.json b/railties/test/isolation/assets/package.json
index 106b1029f0..7c34450fe0 100644
--- a/railties/test/isolation/assets/package.json
+++ b/railties/test/isolation/assets/package.json
@@ -2,6 +2,8 @@
   "name": "dummy",
   "private": true,
   "dependencies": {
+    "@rails/actioncable": "file:../../../../actioncable",
+    "@rails/activestorage": "file:../../../../activestorage",
     "@rails/ujs": "file:../../../../actionview",
     "@rails/webpacker": "https://github.com/rails/webpacker.git",
     "turbolinks": "^5.2.0"