1 files changed, 1 insertions, 1 deletions
diff --git a/src/pages/sitemap/categories.xml.js b/src/pages/sitemap/categories.xml.js
index 61fe42d1..18c8a8f3 100644
--- a/src/pages/sitemap/categories.xml.js
+++ b/src/pages/sitemap/categories.xml.js
@@ -32,7 +32,7 @@ function addUrlToSitemap(sitemap, name, id) {
   // const date = '2025-10-30';
   const url = sitemap.ele('url');
   url.ele('loc', createSlug(baseUrl, name, id));
-  url.ele('lastmod', date);
+  url.ele('lastmod', date.toISOString().slice(0, 10));
   url.ele('changefreq', 'weekly');
   url.ele('priority', '0.6');
 }