diff --git a/package.json b/package.json
index e1700f2e..b33ea2f6 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   "devDependencies": {
     "bower": "1.5.2",
     "browserify": "11.0.0",
-    "clean-css": "3.3.6",
+    "clean-css": "4.2.3",
     "electron-prebuilt": "0.30.1",
     "hihat": "1.2.1",
     "jshint": "2.8.0",