diff --git a/package.json b/package.json
index 8fa882f1..961cefe9 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,7 @@
     "standard-version": "^7.0.0",
     "webpack": "^4.41.2",
     "webpack-cli": "^3.3.10",
-    "webpack-dev-server": "^3.8.2"
+    "webpack-dev-server": "^3.9.0"
   },
   "homepage": "https://github.com/kintone/plugin-packer",
   "repository": {