diff --git a/package.json b/package.json
index 04459c9..df86650 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
     "del": "^3.0.0",
     "gulp": "^4.0.0",
     "gulp-autoprefixer": "^6.0.0",
-    "gulp-clean-css": "^3.10.0",
+    "gulp-clean-css": "^4.0.0",
     "gulp-cli": "^2.0.1",
     "gulp-concat": "^2.6.1",
     "gulp-header": "^2.0.5",