diff --git a/README.md b/README.md
index d944b8e..4cfbaa9 100644
--- a/README.md
+++ b/README.md
@@ -58,4 +58,4 @@ Licenses of text data can be found in this [README](https://github.com/CTeX-org/
 
 -----
 
-Copyright (C) 2017–2022 by Xiangdong Zeng.
+Copyright (C) 2017–2024 by Xiangdong Zeng.
diff --git a/zhlipsum-text.dtx b/zhlipsum-text.dtx
index 72302cf..3bf8661 100644
--- a/zhlipsum-text.dtx
+++ b/zhlipsum-text.dtx
@@ -1,6 +1,6 @@
 % \iffalse meta-comment
 %
-% Copyright (C) 2017--2022 by Xiangdong Zeng <xdzeng96@gmail.com>
+% Copyright (C) 2017--2024 by Xiangdong Zeng <xdzeng96@gmail.com>
 %
 % This work may be distributed and/or modified under the
 % conditions of the LaTeX Project Public License, either
diff --git a/zhlipsum.dtx b/zhlipsum.dtx
index 4376db2..8698b5d 100644
--- a/zhlipsum.dtx
+++ b/zhlipsum.dtx
@@ -1,6 +1,6 @@
 % \iffalse meta-comment
 %
-% Copyright (C) 2017--2022 by Xiangdong Zeng <xdzeng96@gmail.com>
+% Copyright (C) 2017--2024 by Xiangdong Zeng <xdzeng96@gmail.com>
 %
 % This work may be distributed and/or modified under the
 % conditions of the LaTeX Project Public License, either
@@ -85,7 +85,7 @@ version.
 
 -----
 
-Copyright (C) 2017&ndash;2022 by Xiangdong Zeng <xdzeng96@gmail.com>.
+Copyright (C) 2017&ndash;2024 by Xiangdong Zeng <xdzeng96@gmail.com>.
 %</readme>
 %
 %<*internal>
@@ -102,7 +102,7 @@ Copyright (C) 2017&ndash;2022 by Xiangdong Zeng <xdzeng96@gmail.com>.
 
 \preamble
 
-    Copyright (C) 2017--2022 by Xiangdong Zeng <xdzeng96@gmail.com>
+    Copyright (C) 2017--2024 by Xiangdong Zeng <xdzeng96@gmail.com>
 
     This work may be distributed and/or modified under the
     conditions of the LaTeX Project Public License, either