diff --git a/package.json b/package.json
index d5e4579..dfd1e96 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   "devDependencies": {
     "@types/debug": "0.0.29",
     "@types/express": "4.0.35",
-    "@types/mocha": "2.2.39",
+    "@types/mocha": "2.2.40",
     "@types/event-stream": "3.3.30",
     "@types/gulp": "4.0.0",
     "@types/gulp-typescript": "0.0.32",