diff --git a/package.json b/package.json
index 7a9d219b7..93ebc03bc 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "grunt-closure-tools": "~1.0.0",
     "grunt-complexity": "~1.1.0",
     "grunt-contrib-cssmin": "~4.0.0",
-    "grunt-contrib-concat": "~1.0.1",
+    "grunt-contrib-concat": "~2.1.0",
     "grunt-contrib-htmlmin": "~3.1.0",
     "grunt-contrib-jasmine": "3.0.0",
     "grunt-contrib-jshint": "~3.0.0",