diff --git a/package.json b/package.json
index 221b97b..5c940fd 100644
--- a/package.json
+++ b/package.json
@@ -71,7 +71,7 @@
   "devDependencies": {
     "@types/mocha": "^2.2.32",
     "@types/node": "^7.0.12",
-    "mocha": "^3.2.0",
+    "mocha": "^4.0.0",
     "tslint": "^5.1.0",
     "typescript": "^2.0.3",
     "vscode": "^1.1.0"