diff --git a/frontend/scripts/generate-sitemap.js b/frontend/scripts/generate-sitemap.js
index f30786c..bf6c9fe 100644
--- a/frontend/scripts/generate-sitemap.js
+++ b/frontend/scripts/generate-sitemap.js
@@ -19,7 +19,6 @@ const fetchPosts = async tagName => (await axios.get (`${ API_BASE_URL }/posts`,
     { params: { ...(tagName && { tags:  tagName,
                                  match: 'all',
                                  limit: '20' }) } })).data.posts
-const fetchPostIds = async () => (await fetchPosts ()).map (post => post.id)
 
 const fetchTags = async () => (await axios.get (`${ API_BASE_URL }/tags`)).data
 const fetchTagNames = async () => (await fetchTags ()).map (tag => tag.name)
@@ -33,7 +32,7 @@ const createPostListOutlet = async tagName => `
         <div class="flex gap-4"><a href="#" class="font-bold">広場</a></div>
         <div class="mt-2">
           <div class="flex flex-wrap gap-6 p-4">
-            ${ (await fetchPosts (tagName)).map (post => `
+            ${ (await fetchPosts (tagName)).slice (0, 20).map (post => `
                 <a class="w-40 h-40 overflow-hidden rounded-lg shadow-md hover:shadow-lg"
                    href="/posts/${ post.id }">
                   <img alt="${ post.title }"
@@ -42,7 +41,7 @@ const createPostListOutlet = async tagName => `
                        fetchpriority="high"
                        decoding="async"
                        class="object-none w-full h-full"
-                       src="${ post.url }" />
+                       src="${ post.thumbnail }" />
                 </a>`).join ('') }
           </div>
         </div>