diff --git a/pytket/extensions/qulacs/backends/__init__.py b/pytket/extensions/qulacs/backends/__init__.py
index 858cb5b..64690e2 100644
--- a/pytket/extensions/qulacs/backends/__init__.py
+++ b/pytket/extensions/qulacs/backends/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2023 Cambridge Quantum Computing
+# Copyright 2019-2024 Cambridge Quantum Computing
 #
 # 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/pytket/extensions/qulacs/backends/qulacs_backend.py b/pytket/extensions/qulacs/backends/qulacs_backend.py
index 77563fe..3859142 100644
--- a/pytket/extensions/qulacs/backends/qulacs_backend.py
+++ b/pytket/extensions/qulacs/backends/qulacs_backend.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2023 Cambridge Quantum Computing
+# Copyright 2019-2024 Cambridge Quantum Computing
 #
 # 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/pytket/extensions/qulacs/qulacs_convert.py b/pytket/extensions/qulacs/qulacs_convert.py
index 00aaa52..9d5cb2f 100644
--- a/pytket/extensions/qulacs/qulacs_convert.py
+++ b/pytket/extensions/qulacs/qulacs_convert.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2023 Cambridge Quantum Computing
+# Copyright 2019-2024 Cambridge Quantum Computing
 #
 # 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/setup.py b/setup.py
index c316ae1..36a5ca5 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2023 Cambridge Quantum Computing
+# Copyright 2020-2024 Cambridge Quantum Computing
 #
 # 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/tests/test_qulacs_backend.py b/tests/test_qulacs_backend.py
index d2d37d2..cc52e22 100644
--- a/tests/test_qulacs_backend.py
+++ b/tests/test_qulacs_backend.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2023 Cambridge Quantum Computing
+# Copyright 2020-2024 Cambridge Quantum Computing
 #
 # 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/tests/test_qulacs_convert.py b/tests/test_qulacs_convert.py
index 4f3b390..91abe6f 100644
--- a/tests/test_qulacs_convert.py
+++ b/tests/test_qulacs_convert.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2023 Cambridge Quantum Computing
+# Copyright 2020-2024 Cambridge Quantum Computing
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.