diff --git a/package.json b/package.json
index 503cf6e..1e8e25e 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   },
   "devDependencies": {
     "chai": "^4.2.0",
-    "mocha": "^8.1.1",
+    "mocha": "^9.0.0",
     "nyc": "^15.1.0",
     "prettier": "^2.0.5",
     "xo": "^0.32.1"