diff --git a/packages/react-scripts/package.json b/packages/react-scripts/package.json
index 46e9a00a020..151060774e9 100644
--- a/packages/react-scripts/package.json
+++ b/packages/react-scripts/package.json
@@ -59,10 +59,10 @@
     "style-loader": "0.19.1",
     "svgr": "1.8.1",
     "sw-precache-webpack-plugin": "0.11.4",
-    "thread-loader": "1.1.2",
+    "thread-loader": "2.1.1",
     "uglifyjs-webpack-plugin": "1.1.6",
     "url-loader": "0.6.2",
-    "webpack": "3.10.0",
+    "webpack": "4.0.0",
     "webpack-dev-server": "2.11.0",
     "webpack-manifest-plugin": "1.3.2",
     "whatwg-fetch": "2.0.3"