diff --git a/LICENSE.txt b/LICENSE.txt
index f28c8c4..58eb46a 100644
--- a/LICENSE.txt
+++ b/LICENSE.txt
@@ -1,6 +1,6 @@
 The MIT License
 
-Copyright (c) 2023 Takayuki Kamiyama
+Copyright (c) 2023-2024 Takayuki Kamiyama
 
 Permission is hereby granted, free of charge,
 to any person obtaining a copy of this software and