diff --git a/package.json b/package.json
index c6de2c5..9944b5f 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "dirty-chai": "^2.0.1",
     "jsdom": "^11.1.0",
     "jsdom-global": "^3.0.2",
-    "mocha": "^3.5.0",
+    "mocha": "^4.0.0",
     "mocha-lcov-reporter": "^1.3.0",
     "nyc": "^11.1.0",
     "proxyquire": "^1.8.0",