diff --git a/package.json b/package.json
index 5a861ef..f9fc402 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "global-replaceify": "1.0.0",
     "grunt": "1.4.0",
     "grunt-babel": "8.0.0",
-    "grunt-contrib-concat": "1.0.1",
+    "grunt-contrib-concat": "2.0.0",
     "grunt-replace": "2.0.2",
     "gruntify-eslint": "5.0.0",
     "istanbul-lib-instrument": "4.0.3",