diff --git a/sitemap.xml b/sitemap.xml
index c263f03e1..ed3078483 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -9194,7 +9194,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2005/persano/index.html</loc>
-    <lastmod>2024-04-19T08:15:53+00:00</lastmod>
+    <lastmod>2024-04-21T07:21:56+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2005/persano/Makefile</loc>
@@ -9218,7 +9218,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2005/persano/README.md</loc>
-    <lastmod>2024-04-12T18:22:04+00:00</lastmod>
+    <lastmod>2024-04-21T07:21:39+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2005/persano/try.sh</loc>
@@ -12290,7 +12290,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2013/birken/index.html</loc>
-    <lastmod>2024-04-21T03:59:35+00:00</lastmod>
+    <lastmod>2024-04-21T07:33:55+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2013/birken/ioccc.txt</loc>
@@ -12402,7 +12402,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2013/birken/README.md</loc>
-    <lastmod>2024-04-21T03:36:52+00:00</lastmod>
+    <lastmod>2024-04-21T07:33:35+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2013/birken/rhino.txt</loc>
@@ -15854,7 +15854,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2018/ferguson/index.html</loc>
-    <lastmod>2024-04-19T08:16:43+00:00</lastmod>
+    <lastmod>2024-04-21T07:51:55+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2018/ferguson/Makefile</loc>
@@ -15886,7 +15886,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2018/ferguson/README.md</loc>
-    <lastmod>2024-04-17T07:38:26+00:00</lastmod>
+    <lastmod>2024-04-21T07:51:40+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2018/ferguson/rpm.html</loc>
@@ -16430,7 +16430,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/ciura/index.html</loc>
-    <lastmod>2024-04-19T08:16:47+00:00</lastmod>
+    <lastmod>2024-04-21T07:56:55+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/ciura/it.alt.sh</loc>
@@ -16470,7 +16470,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/ciura/README.md</loc>
-    <lastmod>2024-04-12T18:22:04+00:00</lastmod>
+    <lastmod>2024-04-21T07:56:43+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/ciura/ru.alt.sh</loc>
@@ -17046,7 +17046,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/poikola/index.html</loc>
-    <lastmod>2024-04-19T08:16:53+00:00</lastmod>
+    <lastmod>2024-04-21T08:11:53+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/poikola/Makefile</loc>
@@ -17074,7 +17074,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/poikola/README.md</loc>
-    <lastmod>2024-04-17T07:39:47+00:00</lastmod>
+    <lastmod>2024-04-21T08:11:48+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2019/poikola/try.alt.sh</loc>
@@ -17518,7 +17518,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson1/index.html</loc>
-    <lastmod>2024-04-19T08:16:57+00:00</lastmod>
+    <lastmod>2024-04-21T08:35:09+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson1/ioccc-cake.jpg</loc>
@@ -17562,7 +17562,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson1/README.md</loc>
-    <lastmod>2024-04-18T22:49:36+00:00</lastmod>
+    <lastmod>2024-04-21T08:35:01+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson1/snake.1</loc>
@@ -17622,7 +17622,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson2/index.html</loc>
-    <lastmod>2024-04-19T08:16:57+00:00</lastmod>
+    <lastmod>2024-04-21T09:10:26+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson2/input.txt</loc>
@@ -17670,7 +17670,7 @@
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson2/README.md</loc>
-    <lastmod>2024-04-17T07:40:06+00:00</lastmod>
+    <lastmod>2024-04-21T09:10:15+00:00</lastmod>
 </url>
 <url>
     <loc>https://ioccc-src.github.io/temp-test-ioccc/2020/ferguson2/recode.1</loc>