diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 082c30ecb..c09c7a184 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -1,8 +1,8 @@
 name: Deploy
 
 on:
-  #schedule:
-  #  - cron: '5 23 * * 0' # 08:05(Mon) JST
+  schedule:
+    - cron: '5 23 * * 0' # 08:05(Mon) JST
   workflow_dispatch:
 
 jobs:
diff --git a/public/robots.txt b/public/robots.txt
new file mode 100644
index 000000000..c1f0e24a9
--- /dev/null
+++ b/public/robots.txt
@@ -0,0 +1,4 @@
+User-agent: *
+Allow: /
+
+Sitemap: https://https://astro-notion-blog-454.pages.dev/sitemap.xml
diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
index 176f8c796..9055c8387 100644
--- a/src/layouts/Layout.astro
+++ b/src/layouts/Layout.astro
@@ -68,6 +68,7 @@ if (database.Icon && database.Icon.Type === 'file') {
     <meta name="twitter:description" content={siteDescription} />
     <meta name="twitter:card" content="summary_large_image" />
     <meta name="twitter:image" content={ogImage || siteOGImage} />
+    <meta name="google-site-verification" content="TcZnkLcogaFHubmWllXmhijoPPo1qWw4hkcHqU809XQ" />
     <link
       rel="stylesheet"
       href="https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.css"
diff --git a/src/lib/generate-sitemap.ts b/src/lib/generate-sitemap.ts
new file mode 100644
index 000000000..808fd735f
--- /dev/null
+++ b/src/lib/generate-sitemap.ts
@@ -0,0 +1,26 @@
+type SitemapItem = {
+  loc: string
+  lastmod: Date
+}
+
+function formatDate(date: Date): string {
+  const year = date.getFullYear()
+  const month = String(date.getMonth() + 1).padStart(2, '0')
+  const day = String(date.getDate()).padStart(2, '0')
+  return `${year}-${month}-${day}`
+}
+
+export function generateSitemap(items: SitemapItem[]) {
+  const itemsStr = items
+    .map(
+      ({ loc, lastmod }) =>
+        `<url><loc>${loc}</loc><lastmod>${formatDate(lastmod)}</lastmod></url>`
+    )
+    .join('')
+
+  return `<?xml version="1.0" encoding="UTF-8"?>
+     <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+       ${itemsStr}
+     </urlset>
+   `
+}
diff --git a/src/pages/sitemap.xml.ts b/src/pages/sitemap.xml.ts
new file mode 100644
index 000000000..a9dedf23d
--- /dev/null
+++ b/src/pages/sitemap.xml.ts
@@ -0,0 +1,24 @@
+import { generateSitemap } from '../lib/generate-sitemap'
+import { getAllPosts } from '../lib/notion/client'
+import { getPostLink } from '../lib/blog-helpers'
+
+export async function GET() {
+  const [posts] = await Promise.all([getAllPosts()])
+
+  const sitemapItems = posts.map((post) => {
+    const updateDate = post.UpdateDate ? new Date(post.UpdateDate) : null
+    const lastmod = updateDate || new Date(post.Date)
+
+    return {
+      loc: new URL(getPostLink(post.Slug), import.meta.env.SITE).toString(),
+      lastmod,
+    }
+  })
+
+  const sitemap = generateSitemap(sitemapItems)
+
+  const res = new Response(sitemap)
+  res.headers.set('Content-Type', 'text/xml')
+
+  return res
+}