diff --git a/index.html b/index.html
index 81dd2e0..3fa9946 100644
--- a/index.html
+++ b/index.html
@@ -514,7 +514,7 @@ but this will cause an error:
 
 <p>This program is distributed under the terms of the GNU General Public License (GPL) version 3.</p>
 
-<p>&copy; Copyright 2015-2024 Sei Lisa. All rights reserved.</p>
+<p>&copy; Copyright 2015-2025 Sei Lisa. All rights reserved.</p>
 
 <p>Just to put it explicitly, processing code with this optimizer does NOT automatically make the result fall under the terms of the license. Only the optimizer itself is subject to the terms of the GPL, similarly to how the C code compiled by a GPL-licensed compiler is not subject to the licensing requirements of the compiler even if the compiler itself is.</p>