diff --git a/functions/package-lock.json b/functions/package-lock.json
index 7783273..98b6675 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -479,9 +479,9 @@
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     },
     "@types/mocha": {
-      "version": "8.0.4",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.0.4.tgz",
-      "integrity": "sha512-M4BwiTJjHmLq6kjON7ZoI2JMlBvpY3BYSdiP6s/qCT3jb1s9/DeJF0JELpAxiVSIxXDzfNKe+r7yedMIoLbknQ==",
+      "version": "9.1.1",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-9.1.1.tgz",
+      "integrity": "sha512-Z61JK7DKDtdKTWwLeElSEBcWGRLY8g95ic5FoQqI9CMx0ns/Ghep3B4DfcEimiKMvtamNVULVNKEsiwV3aQmXw==",
       "dev": true
     },
     "@types/node": {
diff --git a/functions/package.json b/functions/package.json
index 952b536..8f682dc 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -26,7 +26,7 @@
   "devDependencies": {
     "@types/chai": "^4.2.12",
     "@types/chai-as-promised": "^7.1.3",
-    "@types/mocha": "^8.0.4",
+    "@types/mocha": "^9.1.1",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "firebase-functions-test": "^0.2.3",