diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7917ee6..2337dd5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-# Copyright 2023 the JayCeS authors. All rights reserved.
+# Copyright 2023-2024 the JayCeS authors. All rights reserved.
 #
 # MIT license.
 
diff --git a/LICENSE b/LICENSE
index 51d93cc..1390261 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2023 Jen-Chieh Shen
+Copyright (c) 2023-present Jen-Chieh Shen
 
 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/include/basic.hpp b/include/basic.hpp
index 4ebe3bd..e962753 100644
--- a/include/basic.hpp
+++ b/include/basic.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/include/env.hpp b/include/env.hpp
index 0cb73ed..23fa4d6 100644
--- a/include/env.hpp
+++ b/include/env.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/include/lexer.hpp b/include/lexer.hpp
index 8efff89..dedec23 100644
--- a/include/lexer.hpp
+++ b/include/lexer.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/include/logger.hpp b/include/logger.hpp
index 12972fc..a9835fe 100644
--- a/include/logger.hpp
+++ b/include/logger.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/include/parser.hpp b/include/parser.hpp
index 337f0b9..c20214e 100644
--- a/include/parser.hpp
+++ b/include/parser.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/include/token.hpp b/include/token.hpp
index 37f6478..8eafb38 100644
--- a/include/token.hpp
+++ b/include/token.hpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/scripts/build.bat b/scripts/build.bat
index 0e0bb94..8c026d2 100644
--- a/scripts/build.bat
+++ b/scripts/build.bat
@@ -1,4 +1,4 @@
-:: Copyright 2023 the JayCeS authors. All rights reserved.
+:: Copyright 2023-2024 the JayCeS authors. All rights reserved.
 ::
 :: MIT license.
 
diff --git a/scripts/build_cmake.bat b/scripts/build_cmake.bat
index a5a83b9..466f599 100644
--- a/scripts/build_cmake.bat
+++ b/scripts/build_cmake.bat
@@ -1,4 +1,4 @@
-:: Copyright 2023 the JayCeS authors. All rights reserved.
+:: Copyright 2023-2024 the JayCeS authors. All rights reserved.
 ::
 :: MIT license.
 
diff --git a/scripts/run.bat b/scripts/run.bat
index 564bf13..39eb923 100644
--- a/scripts/run.bat
+++ b/scripts/run.bat
@@ -1,4 +1,4 @@
-:: Copyright 2023 the JayCeS authors. All rights reserved.
+:: Copyright 2023-2024 the JayCeS authors. All rights reserved.
 ::
 :: MIT license.
 
diff --git a/src/lexer.cpp b/src/lexer.cpp
index bf42dea..4eaa387 100644
--- a/src/lexer.cpp
+++ b/src/lexer.cpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/src/logger.cpp b/src/logger.cpp
index 9d4b4b3..5f96f0b 100644
--- a/src/logger.cpp
+++ b/src/logger.cpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */
diff --git a/src/main.cpp b/src/main.cpp
index 89eb850..5efad93 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,5 @@
 /**
- * Copyright 2023 the JayCeS authors. All rights reserved.
+ * Copyright 2023-2024 the JayCeS authors. All rights reserved.
  *
  * MIT license.
  */