diff --git a/package.json b/package.json
index 072e97c..3967ac4 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "chai": "^3.5.0",
     "eslint": "^3.16.1",
     "microbundle": "^0.4.4",
-    "mocha": "^3.2.0"
+    "mocha": "^5.1.1"
   },
   "eslintConfig": {
     "extends": "eslint:recommended",