diff --git a/parlai/mturk/core/legacy_2018/react_server/package.json b/parlai/mturk/core/legacy_2018/react_server/package.json
index e1458d31363..b974256c611 100644
--- a/parlai/mturk/core/legacy_2018/react_server/package.json
+++ b/parlai/mturk/core/legacy_2018/react_server/package.json
@@ -28,7 +28,7 @@
     "babel-loader": "^8.0.2",
     "css-loader": "^1.0.0",
     "style-loader": "^0.23.0",
-    "webpack": "^4.19.1",
+    "webpack": "^5.0.0",
     "webpack-cli": "^3.1.1"
   }
 }