diff --git a/parlai/mturk/core/react_server/package.json b/parlai/mturk/core/react_server/package.json
index ac596c2c93a..79a24bdb136 100644
--- a/parlai/mturk/core/react_server/package.json
+++ b/parlai/mturk/core/react_server/package.json
@@ -30,6 +30,6 @@
     "style-loader": "^0.23.0",
     "url-loader": "^2.0.1",
     "webpack": "^4.19.1",
-    "webpack-cli": "^3.1.1"
+    "webpack-cli": "^4.0.0"
   }
 }