diff --git a/crawler/package.json b/crawler/package.json
index 43fec1ef..4a727881 100644
--- a/crawler/package.json
+++ b/crawler/package.json
@@ -26,7 +26,7 @@
   "dependencies": {
     "@fastify/cookie": "9.3.1",
     "@fastify/cors": "9.0.1",
-    "@fastify/session": "10.7.2",
+    "@fastify/session": "10.9.0",
     "fastify": "4.27.0"
   },
   "devDependencies": {
diff --git a/crawler/src/api/endpoint/twitter-router.ts b/crawler/src/api/endpoint/twitter-router.ts
index 7efaae91..7e0e1cec 100644
--- a/crawler/src/api/endpoint/twitter-router.ts
+++ b/crawler/src/api/endpoint/twitter-router.ts
@@ -129,7 +129,7 @@ export class TwitterRouter extends BaseRouter {
     // アクセストークンの保存
     request.session.set('accessToken', accessToken)
     request.session.set('accessSecret', accessSecret)
-    request.session.set('twitterUserId', me.id)
+    request.session.set('twitterUserId', me.id.toString())
 
     // リダイレクト
     await (sessionBackUrl
diff --git a/crawler/yarn.lock b/crawler/yarn.lock
index d09257d2..4efb1777 100644
--- a/crawler/yarn.lock
+++ b/crawler/yarn.lock
@@ -250,10 +250,10 @@
   dependencies:
     fast-deep-equal "^3.1.3"
 
-"@fastify/session@10.7.2":
-  version "10.7.2"
-  resolved "https://registry.yarnpkg.com/@fastify/session/-/session-10.7.2.tgz#8c4441133257075fc7eb79ce31b9a9d594e32ea8"
-  integrity sha512-PezR26nY8FMmAs4cww5rpnVyRkPDv2WQcVBLEKrtLTQy8mjL+twUKv9TLo/SXZYHZOIETzmquWoLYlnY3dSb+w==
+"@fastify/session@10.9.0":
+  version "10.9.0"
+  resolved "https://registry.yarnpkg.com/@fastify/session/-/session-10.9.0.tgz#7c703a4513274a5a183bd3095eb9b49714b494a5"
+  integrity sha512-u/c42RuAaxCeEuRCAwK2+/SfGqKOd0NSyRzEvDwFBWySQoKUZQyb9OmmJSWJBbOP1OfaU2OsDrjbPbghE1l/YQ==
   dependencies:
     fastify-plugin "^4.0.0"
     safe-stable-stringify "^2.3.1"