diff --git a/package-lock.json b/package-lock.json
index fb7f90b..6a6e47f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,9 +29,9 @@
       }
     },
     "@types/mocha": {
-      "version": "8.2.1",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.2.1.tgz",
-      "integrity": "sha512-NysN+bNqj6E0Hv4CTGWSlPzMW6vTKjDpOteycDkV4IWBsO+PU48JonrPzV9ODjiI2XrjmA05KInLgF5ivZ/YGQ==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-9.0.0.tgz",
+      "integrity": "sha512-scN0hAWyLVAvLR9AyW7HoFF5sJZglyBsbPuHO4fv7JRvfmPBMfp1ozWqOf/e4wwPNxezBZXRfWzMb6iFLgEVRA==",
       "dev": true
     },
     "@types/node": {
diff --git a/package.json b/package.json
index 4398630..f8ddc57 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
   "author": "Ryo Ota",
   "license": "MIT",
   "devDependencies": {
-    "@types/mocha": "^8.2.1",
+    "@types/mocha": "^9.0.0",
     "@types/node": "^12.12.29",
     "@types/power-assert": "^1.5.0",
     "espower-typescript": "^9.0.0",