diff --git a/package.json b/package.json
index b1ceb04b1..abce6ec8f 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
   },
   "devDependencies": {
     "@types/chai": "^4.2.11",
-    "@types/mocha": "^8.0.0",
+    "@types/mocha": "^9.0.0",
     "@types/node": "^14.11.2",
     "@wessberg/rollup-plugin-ts": "^1.3.2",
     "c8": "^7.7.0",