diff --git a/package.json b/package.json
index 1126bde8a1..6488e292fe 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "addons-linter": "0.17.0",
-    "clean-css": "4.0.8",
+    "clean-css": "4.0.9",
     "clean-css-cli": "4.0.8",
     "less": "2.7.2",
     "stylus": "0.54.5",