diff --git a/include/gmssl/block_cipher.h b/include/gmssl/block_cipher.h
index f21a0479..28c38285 100644
--- a/include/gmssl/block_cipher.h
+++ b/include/gmssl/block_cipher.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
  *  not use this file except in compliance with the License.
diff --git a/include/gmssl/digest.h b/include/gmssl/digest.h
index 4a3fa1a1..5eaaacf8 100644
--- a/include/gmssl/digest.h
+++ b/include/gmssl/digest.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
  *  not use this file except in compliance with the License.
diff --git a/include/gmssl/hmac.h b/include/gmssl/hmac.h
index 581aa6e3..cbcb3ce6 100644
--- a/include/gmssl/hmac.h
+++ b/include/gmssl/hmac.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
  *  not use this file except in compliance with the License.
diff --git a/include/gmssl/pbkdf2.h b/include/gmssl/pbkdf2.h
index 2b26b086..677a47e1 100644
--- a/include/gmssl/pbkdf2.h
+++ b/include/gmssl/pbkdf2.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
  *  not use this file except in compliance with the License.