diff --git a/package.json b/package.json
index 69bdf7a576..ae50684f67 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
 		"@fortawesome/vue-fontawesome": "0.1.10",
 		"@koa/cors": "3.1.0",
 		"@koa/multer": "3.0.0",
-		"@koa/router": "9.3.1",
+		"@koa/router": "9.0.1",
 		"@sinonjs/fake-timers": "6.0.1",
 		"@syuilo/aiscript": "0.7.2",
 		"@types/bcryptjs": "2.4.2",
diff --git a/yarn.lock b/yarn.lock
index cb62324c9b..cc5c90beac 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -160,10 +160,10 @@
   resolved "https://registry.yarnpkg.com/@koa/multer/-/multer-3.0.0.tgz#439777949f28097d7b329c0b4ce3048074c862f8"
   integrity sha512-y+OQBmex5D1jIl723gAEUYcAWPEicIXppaAKw/zCMfpllQ08ZNweDPwoCLxEoatqd5pCu2XG6V8dl67JRq3RJw==
 
-"@koa/router@9.3.1":
-  version "9.3.1"
-  resolved "https://registry.yarnpkg.com/@koa/router/-/router-9.3.1.tgz#814b0f357da616b99ee22259644cd928f2c9e60e"
-  integrity sha512-OOy4pOEO+Zz5vy+zqc8mWRGKYIpDqjgbVTF/U41fCwBwVWHGmkedvcJ9V5MLI7Ivy0iTv8o0XLDtGWtYHquvxg==
+"@koa/router@9.0.1":
+  version "9.0.1"
+  resolved "https://registry.yarnpkg.com/@koa/router/-/router-9.0.1.tgz#4090a14223ea7e78aa13b632761209cba69acd95"
+  integrity sha512-OI+OU49CJV4px0WkIMmayBeqVXB/JS1ZMq7UoGlTZt6Y7ijK7kdeQ18+SEHHJPytmtI1y6Hf8XLrpxva3mhv5Q==
   dependencies:
     debug "^4.1.1"
     http-errors "^1.7.3"