diff --git a/LICENSE b/LICENSE
index e3ff754..bfbd0aa 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright IBM Corp. 2013, 2025
+Copyright IBM Corp. 2013, 2026
 
 Mozilla Public License, version 2.0
 
diff --git a/level.go b/level.go
index 6381bf1..e6e0405 100644
--- a/level.go
+++ b/level.go
@@ -1,3 +1,5 @@
+// Copyright IBM Corp. 2013, 2026
+
 // Package logutils augments the standard log package with levels.
 package logutils
 
diff --git a/level_benchmark_test.go b/level_benchmark_test.go
index 3c2caf7..e37c484 100644
--- a/level_benchmark_test.go
+++ b/level_benchmark_test.go
@@ -1,3 +1,5 @@
+// Copyright IBM Corp. 2013, 2026
+
 package logutils
 
 import (
diff --git a/level_test.go b/level_test.go
index f6b6ac3..60531a3 100644
--- a/level_test.go
+++ b/level_test.go
@@ -1,3 +1,5 @@
+// Copyright IBM Corp. 2013, 2026
+
 package logutils
 
 import (