diff --git a/package.json b/package.json
index c7e07ad..b311c22 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
   "devDependencies": {
     "assume": "~1.5.0",
     "browserify": "~15.2.0",
-    "mocha": "~4.1.0",
+    "mocha": "~5.0.0",
     "nyc": "~11.4.1",
     "pre-commit": "~1.2.0",
     "sauce-browsers": "~1.0.0",