diff --git a/package.json b/package.json
index 8910f14..b563bf2 100644
--- a/package.json
+++ b/package.json
@@ -20,7 +20,7 @@
     "autoprefixer": "~10.4",
     "browser-pack-flat": "~3.5",
     "browserify": "~17.0",
-    "cssnano": "~5.1",
+    "cssnano": "~6.0",
     "eslint": "~8.36",
     "eslint-config-standard": "~17.0",
     "eslint-plugin-import": "~2.27",