diff --git a/package.json b/package.json
index 53a02a1..d6a5a1b 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "Typescript Typings for protobufjs",
   "devDependencies": {
     "chai": "^3.5.0",
-    "mocha": "^3.3.0",
+    "mocha": "^4.0.0",
     "source-map-support": "^0.4.0",
     "tslint": "^5.2.0",
     "typescript": "^2.3.2",