diff --git a/packages/@vuepress/core/package.json b/packages/@vuepress/core/package.json
index fb106ac7c5..90b20f4a31 100644
--- a/packages/@vuepress/core/package.json
+++ b/packages/@vuepress/core/package.json
@@ -43,7 +43,7 @@
     "js-yaml": "^3.13.1",
     "lru-cache": "^5.1.1",
     "mini-css-extract-plugin": "0.6.0",
-    "optimize-css-assets-webpack-plugin": "^5.0.1",
+    "optimize-css-assets-webpack-plugin": "^6.0.0",
     "portfinder": "^1.0.13",
     "postcss-loader": "^3.0.0",
     "postcss-safe-parser": "^4.0.1",