diff --git a/LICENSE b/LICENSE
index 0e15fff..e4d6bca 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2017-2023 Taichi Ishitani
+Copyright (c) 2017-2024 Taichi Ishitani
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index 924cba4..c78752c 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Feedbacks, bug reports, questions and etc. are wellcome! You can post them by us
 
 ## Copyright & License
 
-Copyright © 2017-2023 Taichi Ishitani. RgGen::Core is licensed under the [MIT License](https://opensource.org/licenses/MIT), see [LICENSE](LICENSE) for futher details.
+Copyright © 2017-2024 Taichi Ishitani. RgGen::Core is licensed under the [MIT License](https://opensource.org/licenses/MIT), see [LICENSE](LICENSE) for futher details.
 
 ## Code of Conduct