diff --git a/package.json b/package.json
index 106c563..7c6c0c2 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,7 @@
         "grunt-autoprefixer": "3.0.4",
         "grunt-cli": "1.2.0",
         "grunt-contrib-connect": "1.0.2",
-        "grunt-contrib-cssmin": "2.2.1",
+        "grunt-contrib-cssmin": "4.0.0",
         "grunt-contrib-jshint": "1.1.0",
         "grunt-contrib-qunit": "2.0.0",
         "grunt-contrib-uglify": "3.3.0",