diff --git a/LICENSE b/LICENSE
index 20d0bf7..b4c5a5e 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 Taichi Ishitani
+Copyright (c) 2023-2024 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 c082a53..4d256ac 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ $ .rggen-docker --work ../rggen-sample --tag 0.32 -o out -c config.yml block_0.y
 
 ## Copyright & License
 
-Copyright © 2023 Taichi Ishitani. RgGen Docker is licensed under the [MIT License](https://opensource.org/licenses/MIT), see [LICENSE](LICENSE) for futher details.
+Copyright © 2023-2024 Taichi Ishitani. RgGen Docker is licensed under the [MIT License](https://opensource.org/licenses/MIT), see [LICENSE](LICENSE) for futher details.
 
 ## Code of Conduct