diff --git a/resources/map-icons-master/package.json b/resources/map-icons-master/package.json
index adc97da..765fe88 100644
--- a/resources/map-icons-master/package.json
+++ b/resources/map-icons-master/package.json
@@ -13,7 +13,7 @@
     "less-plugin-autoprefix": "^1.5.0",
     "less-plugin-clean-css": "^1.5.1",
     "watch": "^0.13.0",
-    "clean-css": "^3.4.5",
+    "clean-css": "^4.2.3",
     "uglify-js": " ^2.4.23"
   },
   "scripts": {