diff --git a/Gemfile b/Gemfile
index 26052e4..17760a3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # 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/Rakefile b/Rakefile
index b37f356..251727a 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # 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/lib/loog.rb b/lib/loog.rb
index 11f5377..d15d598 100644
--- a/lib/loog.rb
+++ b/lib/loog.rb
@@ -2,7 +2,7 @@
 
 # (The MIT License)
 #
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -34,7 +34,7 @@
 # {README}[https://github.com/yegor256/loog/blob/master/README.md] file.
 #
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright:: Copyright (c) 2018-2024 Yegor Bugayenko
 # License:: MIT
 module Loog
   # Compact formatter
diff --git a/lib/loog/tee.rb b/lib/loog/tee.rb
index 5a228b7..0e8a9e0 100644
--- a/lib/loog/tee.rb
+++ b/lib/loog/tee.rb
@@ -2,7 +2,7 @@
 
 # (The MIT License)
 #
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -33,7 +33,7 @@
 # This way you can log to console and to the file at the same time.
 #
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright:: Copyright (c) 2018-2024 Yegor Bugayenko
 # License:: MIT
 class Loog::Tee
   # Makes an instance.
diff --git a/loog.gemspec b/loog.gemspec
index b88ee09..05f0e04 100644
--- a/loog.gemspec
+++ b/loog.gemspec
@@ -2,7 +2,7 @@
 
 # (The MIT License)
 #
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # 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/test/test_loog.rb b/test/test_loog.rb
index cbad76a..1f0d08b 100644
--- a/test/test_loog.rb
+++ b/test/test_loog.rb
@@ -2,7 +2,7 @@
 
 # (The MIT License)
 #
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -27,7 +27,7 @@
 
 # Loog test.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright:: Copyright (c) 2018-2024 Yegor Bugayenko
 # License:: MIT
 class LoogTest < Minitest::Test
   def test_simple_logging
diff --git a/test/test_tee.rb b/test/test_tee.rb
index b0810b4..6f4df22 100644
--- a/test/test_tee.rb
+++ b/test/test_tee.rb
@@ -2,7 +2,7 @@
 
 # (The MIT License)
 #
-# Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright (c) 2018-2024 Yegor Bugayenko
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the 'Software'), to deal
@@ -28,7 +28,7 @@
 
 # Loog::Tee test.
 # Author:: Yegor Bugayenko (yegor256@gmail.com)
-# Copyright:: Copyright (c) 2018-2023 Yegor Bugayenko
+# Copyright:: Copyright (c) 2018-2024 Yegor Bugayenko
 # License:: MIT
 class TeeTest < Minitest::Test
   def test_simple_logging