diff --git a/package.json b/package.json
index 07a2fbe..8f8122d 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
   "license": "MIT",
   "devDependencies": {
     "@types/chai": "^4.1.7",
-    "@types/mocha": "^5.2.5",
+    "@types/mocha": "^9.0.0",
     "chai": "^4.2.0",
     "mocha": "^6.0.0",
     "nyc": "^13.1.0",