diff --git a/package.json b/package.json
index f790385c..5b80231a 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   },
   "devDependencies": {
     "eslint": "^3.12.0",
-    "mocha": "^3.2.0",
+    "mocha": "^4.0.0",
     "nock": "^9.0.2"
   },
   "main": "./lib/twitter"