diff --git a/package.json b/package.json
index 6662286796..53bbd4c0f7 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "walk": "2.3.9"
   },
   "devDependencies": {
-    "clean-css-cli": "4.0.8",
+    "clean-css-cli": "4.0.9",
     "coveralls": "2.12.0",
     "debounce": "^1.0.0",
     "eslint": "3.17.0",