diff --git a/package.json b/package.json
index 856995f..9e18a7f 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
     "test": "npm-run-all css-lint js-lint"
   },
   "devDependencies": {
-    "clean-css-cli": "^5.3.3",
+    "clean-css-cli": "^5.4.1",
     "eslint": "^7.29.0",
     "npm-run-all": "^4.1.5",
     "sass": "^1.42.1",