diff --git a/package.json b/package.json
index 887d1c9..b16a645 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   "homepage": "https://github.com/bcguan2008/class#readme",
   "dependencies": {
     "chai": "^3.5.0",
-    "mocha": "^2.5.3",
+    "mocha": "^6.0.0",
     "istanbul": "^0.3.8",
     "istanbul-coveralls": "^1.0.2"
   }