diff --git a/package.json b/package.json
index 14aaed1..96a7135 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,6 @@
     "eslint-config-guo": "^0.5.0",
     "eslint-plugin-promise": "^3.5.0",
     "istanbul": "^0.4.5",
-    "mocha": "^4.0.0"
+    "mocha": "^5.1.1"
   }
 }