diff --git a/src/main/java/org/codelibs/fess/crawler/transformer/CustomFessXpathTransformer.java b/src/main/java/org/codelibs/fess/crawler/transformer/CustomFessXpathTransformer.java
index b32e8d6..983bf79 100644
--- a/src/main/java/org/codelibs/fess/crawler/transformer/CustomFessXpathTransformer.java
+++ b/src/main/java/org/codelibs/fess/crawler/transformer/CustomFessXpathTransformer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 CodeLibs Project and the Others.
+ * Copyright 2012-2024 CodeLibs Project and the Others.
  *
  * 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/src/main/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGenerator.java b/src/main/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGenerator.java
index c4dcb0c..66c6d49 100644
--- a/src/main/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGenerator.java
+++ b/src/main/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGenerator.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 CodeLibs Project and the Others.
+ * Copyright 2012-2024 CodeLibs Project and the Others.
  *
  * 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/src/test/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGeneratorTest.java b/src/test/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGeneratorTest.java
index e21d6bf..65e1f2a 100644
--- a/src/test/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGeneratorTest.java
+++ b/src/test/java/org/codelibs/fess/thumbnail/playwright/PlaywrightThumbnailGeneratorTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 CodeLibs Project and the Others.
+ * Copyright 2012-2024 CodeLibs Project and the Others.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.