diff --git a/react_on_rails/spec/dummy/package.json b/react_on_rails/spec/dummy/package.json
index e9998a52db..54da35823b 100644
--- a/react_on_rails/spec/dummy/package.json
+++ b/react_on_rails/spec/dummy/package.json
@@ -57,10 +57,10 @@
     "style-loader": "^3.3.1",
     "terser-webpack-plugin": "5.3.1",
     "url-loader": "^4.0.0",
-    "webpack": "5.72.0",
+    "webpack": "5.94.0",
     "webpack-assets-manifest": "5",
     "webpack-cli": "4",
-    "webpack-dev-server": "^4.9.0",
+    "webpack-dev-server": "^5.2.2",
     "webpack-merge": "5"
   },
   "browser": {
diff --git a/react_on_rails_pro/spec/dummy/package.json b/react_on_rails_pro/spec/dummy/package.json
index d912895538..5f2259a2af 100644
--- a/react_on_rails_pro/spec/dummy/package.json
+++ b/react_on_rails_pro/spec/dummy/package.json
@@ -89,7 +89,7 @@
     "preload-webpack-plugin": "^3.0.0-alpha.1",
     "typescript": "^5.2.2",
     "webpack-cli": "^4.10.0",
-    "webpack-dev-server": "^4.7.3"
+    "webpack-dev-server": "^5.2.2"
   },
   "browser": {
     "fs": false
diff --git a/react_on_rails_pro/spec/execjs-compatible-dummy/package.json b/react_on_rails_pro/spec/execjs-compatible-dummy/package.json
index cb3e96342e..72087f6dbe 100644
--- a/react_on_rails_pro/spec/execjs-compatible-dummy/package.json
+++ b/react_on_rails_pro/spec/execjs-compatible-dummy/package.json
@@ -45,6 +45,6 @@
   "devDependencies": {
     "@pmmmwh/react-refresh-webpack-plugin": "^0.5.15",
     "react-refresh": "^0.14.2",
-    "webpack-dev-server": "4"
+    "webpack-dev-server": "5"
   }
 }