diff --git a/sitemap.xml b/sitemap.xml
index d935aec..1052de0 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -250,7 +250,7 @@
 </url>
 <url>
 <loc>https://boof.eu.org/tools/prime numbers/</loc>
-<lastmod>2023-04-27T10:06:13+02:00</lastmod>
+<lastmod>2023-04-27T10:20:23+02:00</lastmod>
 </url>
 <url>
 <loc>https://boof.eu.org/Games/Flash/Interactive buddy/</loc>