diff --git a/.appveyor.yml b/.appveyor.yml
index 1469385..6439ab6 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,4 +1,4 @@
-#          Copyright Rein Halbersma 2014-2023.
+#          Copyright Rein Halbersma 2014-2024.
 # Distributed under the Boost Software License, Version 1.0.
 #    (See accompanying file LICENSE_1_0.txt or copy at
 #          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/.travis.yml b/.travis.yml
index 61b6c9c..af33191 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-#          Copyright Rein Halbersma 2014-2023.
+#          Copyright Rein Halbersma 2014-2024.
 # Distributed under the Boost Software License, Version 1.0.
 #    (See accompanying file LICENSE_1_0.txt or copy at
 #          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6d92dc..d7f2965 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-#          Copyright Rein Halbersma 2014-2023.
+#          Copyright Rein Halbersma 2014-2024.
 # Distributed under the Boost Software License, Version 1.0.
 #    (See accompanying file LICENSE_1_0.txt or copy at
 #          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/README.md b/README.md
index c567f51..d3f5ba0 100644
--- a/README.md
+++ b/README.md
@@ -371,6 +371,6 @@ Note that this library makes liberal use of C++23 features, such as the `fold_le
 
 ## License
 
-Copyright Rein Halbersma 2014-2023.
+Copyright Rein Halbersma 2014-2024.
 Distributed under the [Boost Software License, Version 1.0](http://www.boost.org/users/license.html).
 (See accompanying file LICENSE_1_0.txt or copy at [http://www.boost.org/LICENSE_1_0.txt](http://www.boost.org/LICENSE_1_0.txt))
diff --git a/include/xstd/bit_set.hpp b/include/xstd/bit_set.hpp
index af5d28c..e56f08d 100644
--- a/include/xstd/bit_set.hpp
+++ b/include/xstd/bit_set.hpp
@@ -1,7 +1,7 @@
 #ifndef XSTD_BIT_SET_HPP
 #define XSTD_BIT_SET_HPP
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 99be90b..924b5fd 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-#          Copyright Rein Halbersma 2014-2023.
+#          Copyright Rein Halbersma 2014-2024.
 # Distributed under the Boost Software License, Version 1.0.
 #    (See accompanying file LICENSE_1_0.txt or copy at
 #          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/adaptor/dynamic_bitset.hpp b/test/include/adaptor/dynamic_bitset.hpp
index 25a1a35..eea8b91 100644
--- a/test/include/adaptor/dynamic_bitset.hpp
+++ b/test/include/adaptor/dynamic_bitset.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/adaptor/flat_set.hpp b/test/include/adaptor/flat_set.hpp
index ed88172..7ccbf5a 100644
--- a/test/include/adaptor/flat_set.hpp
+++ b/test/include/adaptor/flat_set.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/adaptor/std_bitset.hpp b/test/include/adaptor/std_bitset.hpp
index e37bafc..67d7767 100644
--- a/test/include/adaptor/std_bitset.hpp
+++ b/test/include/adaptor/std_bitset.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/adaptor/xstd_bitset.hpp b/test/include/adaptor/xstd_bitset.hpp
index 2c3b73d..a464066 100644
--- a/test/include/adaptor/xstd_bitset.hpp
+++ b/test/include/adaptor/xstd_bitset.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/bitset/exhaustive.hpp b/test/include/bitset/exhaustive.hpp
index 7ba78b5..dc7b43f 100644
--- a/test/include/bitset/exhaustive.hpp
+++ b/test/include/bitset/exhaustive.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/bitset/factory.hpp b/test/include/bitset/factory.hpp
index c8d046c..aa31096 100644
--- a/test/include/bitset/factory.hpp
+++ b/test/include/bitset/factory.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/bitset/primitives.hpp b/test/include/bitset/primitives.hpp
index e955f41..0aa0e5e 100644
--- a/test/include/bitset/primitives.hpp
+++ b/test/include/bitset/primitives.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/concepts.hpp b/test/include/concepts.hpp
index 1370d45..5d8491a 100644
--- a/test/include/concepts.hpp
+++ b/test/include/concepts.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/set/algorithms.hpp b/test/include/set/algorithms.hpp
index 4864fe3..ff159a6 100644
--- a/test/include/set/algorithms.hpp
+++ b/test/include/set/algorithms.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/set/exhaustive.hpp b/test/include/set/exhaustive.hpp
index 6830908..4852dfb 100644
--- a/test/include/set/exhaustive.hpp
+++ b/test/include/set/exhaustive.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/include/set/primitives.hpp b/test/include/set/primitives.hpp
index eb4ef1a..59c5f2f 100644
--- a/test/include/set/primitives.hpp
+++ b/test/include/set/primitives.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/bitset/o0.cpp b/test/src/bitset/o0.cpp
index ed0eab8..116cd58 100644
--- a/test/src/bitset/o0.cpp
+++ b/test/src/bitset/o0.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/bitset/o1.cpp b/test/src/bitset/o1.cpp
index 7ae9f54..632967c 100644
--- a/test/src/bitset/o1.cpp
+++ b/test/src/bitset/o1.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/bitset/o2.cpp b/test/src/bitset/o2.cpp
index 24099f8..a319983 100644
--- a/test/src/bitset/o2.cpp
+++ b/test/src/bitset/o2.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/bitset/o4.cpp b/test/src/bitset/o4.cpp
index 1f390b2..bc76bc0 100644
--- a/test/src/bitset/o4.cpp
+++ b/test/src/bitset/o4.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/bitset/type_traits.cpp b/test/src/bitset/type_traits.cpp
index 722cb34..a090a04 100644
--- a/test/src/bitset/type_traits.cpp
+++ b/test/src/bitset/type_traits.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/constexpr.cpp b/test/src/set/constexpr.cpp
index 4299571..4c69df6 100644
--- a/test/src/set/constexpr.cpp
+++ b/test/src/set/constexpr.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/implicit.cpp b/test/src/set/implicit.cpp
index 07d1b0d..9a890b9 100644
--- a/test/src/set/implicit.cpp
+++ b/test/src/set/implicit.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/o0.cpp b/test/src/set/o0.cpp
index 383acd2..4bd9d14 100644
--- a/test/src/set/o0.cpp
+++ b/test/src/set/o0.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/o1.cpp b/test/src/set/o1.cpp
index c5b49e6..00a6385 100644
--- a/test/src/set/o1.cpp
+++ b/test/src/set/o1.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/o2.cpp b/test/src/set/o2.cpp
index e2fa031..756a9c8 100644
--- a/test/src/set/o2.cpp
+++ b/test/src/set/o2.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/o3.cpp b/test/src/set/o3.cpp
index 714f673..b930b82 100644
--- a/test/src/set/o3.cpp
+++ b/test/src/set/o3.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/o4.cpp b/test/src/set/o4.cpp
index 8c87240..76e1fc3 100644
--- a/test/src/set/o4.cpp
+++ b/test/src/set/o4.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)
diff --git a/test/src/set/type_traits.cpp b/test/src/set/type_traits.cpp
index b66414e..dfcb8be 100644
--- a/test/src/set/type_traits.cpp
+++ b/test/src/set/type_traits.cpp
@@ -1,4 +1,4 @@
-//          Copyright Rein Halbersma 2014-2023.
+//          Copyright Rein Halbersma 2014-2024.
 // Distributed under the Boost Software License, Version 1.0.
 //    (See accompanying file LICENSE_1_0.txt or copy at
 //          http://www.boost.org/LICENSE_1_0.txt)