diff --git a/package.json b/package.json
index f83642e..a8ab38f 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "eslint": "5.15.x",
     "istanbul": "0.4.x",
-    "mocha": "3.5.x",
+    "mocha": "5.2.x",
     "sanctuary-style": "3.0.x",
     "uglify-js": "3.5.x",
     "xyz": "4.0.x"