diff --git a/package.json b/package.json
index 8554afc..bd18302 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
   },
   "dependencies": {
     "chalk": "^1.1.1",
-    "clean-css": "^3.4.9",
+    "clean-css": "^3.4.15",
     "commander": "^2.9.0",
     "convict": "^1.1.2",
     "css-url-rewrite": "^0.9.0",