diff --git a/package.json b/package.json
index fac535e..6ae912f 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "Traversals"
   ],
   "devDependencies": {
-    "mocha": "4.0.1"
+    "mocha": "5.0.1"
   },
   "author": {
     "name": "Dmitriy Rozhkov",