diff --git a/index.html b/index.html
index 743a47efcb2..a986e3b60e7 100644
--- a/index.html
+++ b/index.html
@@ -21,7 +21,7 @@
 
   <!-- https://webmasters.stackexchange.com/a/86922 -->
   <meta property="article:published_time" content="2023-01-02T00:00:00+09:00">
-  <meta property="article:modified_time" content="2023-08-03T01:06:16+09:00">
+  <meta property="article:modified_time" content="2023-08-04T01:06:23+09:00">
 
   <link rel="icon" href="/shiroko-kfcc/favicon.ico" sizes="any">
   <link rel="apple-touch-icon" href="icon.png">