diff --git a/lib/middleware/anti-hotlink.ts b/lib/middleware/anti-hotlink.ts
index 5e5c8ce32f..65cde73156 100644
--- a/lib/middleware/anti-hotlink.ts
+++ b/lib/middleware/anti-hotlink.ts
@@ -4,6 +4,7 @@ import logger from '@/utils/logger';
 import * as path from 'node:path';
 import render from '@/utils/render';
 import { type MiddlewareHandler } from 'hono';
+import { Data } from '@/types';
 
 const templateRegex = /\${([^{}]+)}/g;
 const allowedUrlProperties = new Set(['hash', 'host', 'hostname', 'href', 'origin', 'password', 'pathname', 'port', 'protocol', 'search', 'searchParams', 'username']);
@@ -130,7 +131,7 @@ const middleware: MiddlewareHandler = async (ctx, next) => {
     // and here we will only check them in description.
     // Use Cheerio to load the description as html and filter all
     // image link
-    const data = ctx.get('data');
+    const data: Data = ctx.get('data');
     if (data) {
         if (data.description) {
             data.description = process(data.description, image_hotlink_template, multimedia_hotlink_template, shouldWrapInIframe);
@@ -148,4 +149,4 @@ const middleware: MiddlewareHandler = async (ctx, next) => {
     }
 };
 
-export default middleware;
\ No newline at end of file
+export default middleware;
diff --git a/lib/middleware/cache.ts b/lib/middleware/cache.ts
index 47c1eaab3f..8ae5484859 100644
--- a/lib/middleware/cache.ts
+++ b/lib/middleware/cache.ts
@@ -4,6 +4,7 @@ import type { MiddlewareHandler } from 'hono';
 import { config } from '@/config';
 import { RequestInProgressError } from '@/errors';
 import cacheModule from '@/utils/cache/index'
+import { Data } from '@/types';
 
 // only give cache string, as the `!` condition tricky
 // md5 is used to shrink key size
@@ -48,7 +49,7 @@ const middleware: MiddlewareHandler = async (ctx, next) => {
         throw error;
     }
 
-    const data = ctx.get('data')
+    const data: Data = ctx.get('data');
     if (ctx.res.headers.get('Cache-Control') !== 'no-cache' && data) {
         data.lastBuildDate = new Date().toUTCString();
         ctx.set('data', data)
diff --git a/lib/middleware/header.ts b/lib/middleware/header.ts
index c867e30f20..e32655d437 100644
--- a/lib/middleware/header.ts
+++ b/lib/middleware/header.ts
@@ -3,6 +3,7 @@ import { MiddlewareHandler } from "hono";
 import etagCalculate from "etag";
 import logger from "@/utils/logger";
 import { config } from "@/config";
+import { Data } from "@/types";
 
 const headers: Record<string, string> = {
     'Access-Control-Allow-Methods': 'GET',
@@ -29,7 +30,7 @@ const middleware: MiddlewareHandler = async (ctx, next) => {
 
     await next();
 
-    const data = ctx.get('data');
+    const data: Data = ctx.get('data');
     if (!data || ctx.res.headers.get('ETag')) {
         return;
     }
diff --git a/lib/types.ts b/lib/types.ts
index c983614112..bc708f7279 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -41,4 +41,5 @@ export type Data = {
     author?: string;
     language?: string;
     feedLink?: string;
+    lastBuildDate?: string;
 };