diff --git a/functions/api/[[route]].ts b/functions/api/[[route]].ts
index fb080c7..899eb85 100644
--- a/functions/api/[[route]].ts
+++ b/functions/api/[[route]].ts
@@ -4,6 +4,9 @@ import { Bot, InputFile, InputMediaBuilder } from 'grammy'
 import { Hono } from 'hono'
 import { env } from 'hono/adapter'
 import { handle } from 'hono/cloudflare-pages'
+import { customAlphabet } from 'nanoid'
+
+const nanoid = customAlphabet('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', 8)
 
 const IP_HEADER = 'CF-Connecting-IP'
 
@@ -69,7 +72,7 @@ app.post('/api/v1/suggestion', async (c) => {
     return c.json(newErrorFormat400(), 400)
   }
 
-  const msgs = [`<b>意见箱收到新消息</b>\n`]
+  const msgs = [`<b>意见箱收到新消息</b> #TN-${nanoid()}\n`]
   msgs.push(`${replaceHtmlTag(textContent)}\n`)
   contactContent
   && msgs.push(
diff --git a/functions/package.json b/functions/package.json
index a261d15..a82eaf3 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -8,7 +8,7 @@
   "dependencies": {
     "grammy": "^1.21.1",
     "hono": "^4.0.8",
-    "nano-id": "^1.1.0"
+    "nanoid": "^5.1.0"
   },
   "devDependencies": {
     "@cloudflare/workers-types": "^4.20240208.0"
diff --git a/functions/tsconfig.json b/functions/tsconfig.json
index 4c14493..d2ca13c 100644
--- a/functions/tsconfig.json
+++ b/functions/tsconfig.json
@@ -1,21 +1,21 @@
 {
   "compilerOptions": {
     "target": "ESNext",
-    "module": "ESNext",
-    "moduleResolution": "Bundler",
-    "strict": true,
+    "jsx": "preserve",
     "lib": [
       "ESNext"
     ],
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
     "types": [
       "@cloudflare/workers-types"
     ],
-    "jsx": "preserve",
+    "strict": true,
     "strictNullChecks": true,
     "noImplicitAny": true,
     "noUnusedLocals": true,
     "noUnusedParameters": true,
-    "skipLibCheck": true,
-    "skipDefaultLibCheck": true
-  },
+    "skipDefaultLibCheck": true,
+    "skipLibCheck": true
+  }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ffa549c..7805a28 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -66,9 +66,9 @@ importers:
       hono:
         specifier: ^4.0.8
         version: 4.6.13
-      nano-id:
-        specifier: ^1.1.0
-        version: 1.1.0
+      nanoid:
+        specifier: ^5.1.0
+        version: 5.1.0
     devDependencies:
       '@cloudflare/workers-types':
         specifier: ^4.20240208.0
@@ -2639,14 +2639,16 @@ packages:
   ms@2.1.3:
     resolution: {integrity: sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==}
 
-  nano-id@1.1.0:
-    resolution: {integrity: sha512-vQB87xWh4CCBZq2d7/wF46uiwZOx+n6ShQ4QBuiejQhBSijkTeK6Ugv1EhgjVAg8fwIu9wtWk3GhCN4ViD0TJQ==}
-
   nanoid@3.3.8:
     resolution: {integrity: sha512-WNLf5Sd8oZxOm+TzppcYk8gVOgP+l58xNy58D0nbUnOxOWRWvlcCV4kUF7ltmI6PsrLl/BgKEyS4mqsGChFN0w==}
     engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
     hasBin: true
 
+  nanoid@5.1.0:
+    resolution: {integrity: sha512-zDAl/llz8Ue/EblwSYwdxGBYfj46IM1dhjVi8dyp9LQffoIGxJEAHj2oeZ4uNcgycSRcQ83CnfcZqEJzVDLcDw==}
+    engines: {node: ^18 || >=20}
+    hasBin: true
+
   natural-compare@1.4.0:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
 
@@ -6380,10 +6382,10 @@ snapshots:
 
   ms@2.1.3: {}
 
-  nano-id@1.1.0: {}
-
   nanoid@3.3.8: {}
 
+  nanoid@5.1.0: {}
+
   natural-compare@1.4.0: {}
 
   natural-orderby@5.0.0: {}