diff --git a/package.json b/package.json
index f38e60f..cdd4fde 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   ],
   "devDependencies": {
     "expect.js": ">= 0.1.2",
-    "mocha": "3.3.0",
+    "mocha": "6.2.0",
     "grunt": "~1.0.1",
     "grunt-cli": "~1.2.0",
     "grunt-contrib-jshint": ">= 0.1.1",