diff --git a/package.json b/package.json
index 9221d3c..b8446cf 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,6 @@
   },
   "devDependencies": {
     "assume": "^2.0.0",
-    "mocha": "^4.0.1"
+    "mocha": "^6.0.2"
   }
 }