diff --git a/package.json b/package.json
index 1fc78cd8..0b7642de 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,6 @@
     "object-assign": "^4.0.1"
   },
   "devDependencies": {
-    "clean-css": "^3.4.23",
     "eslint": "^5.5.0",
     "eslint-config-google": "^0.10.0",
     "graceful-fs": "^4.1.11",