diff --git a/src/utils/sitemap.ts b/src/utils/sitemap.ts
index 4a2995e49..32a56db68 100644
--- a/src/utils/sitemap.ts
+++ b/src/utils/sitemap.ts
@@ -85,7 +85,7 @@ async function getLibraryDocsEntries(
 function getBlogEntries(): Array<SitemapEntry> {
   return getPublishedPosts().map((post) => ({
     path: `/blog/${post.slug}`,
-    lastModified: asLastModified(post.published),
+    lastModified: asLastModified(post.updated ?? post.published),
   }))
 }