diff --git a/pytket/extensions/iqm/__init__.py b/pytket/extensions/iqm/__init__.py
index 15f66f5..ae57327 100644
--- a/pytket/extensions/iqm/__init__.py
+++ b/pytket/extensions/iqm/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/iqm/backends/__init__.py b/pytket/extensions/iqm/backends/__init__.py
index b38ad14..1ae3020 100644
--- a/pytket/extensions/iqm/backends/__init__.py
+++ b/pytket/extensions/iqm/backends/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/iqm/backends/config.py b/pytket/extensions/iqm/backends/config.py
index c3fcb75..bd2eb1e 100644
--- a/pytket/extensions/iqm/backends/config.py
+++ b/pytket/extensions/iqm/backends/config.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/iqm/backends/iqm.py b/pytket/extensions/iqm/backends/iqm.py
index dcb444f..6a02add 100644
--- a/pytket/extensions/iqm/backends/iqm.py
+++ b/pytket/extensions/iqm/backends/iqm.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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 e4142c0..3b493c3 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/backend_test.py b/tests/backend_test.py
index f7de2d0..2ffe36b 100644
--- a/tests/backend_test.py
+++ b/tests/backend_test.py
@@ -1,4 +1,4 @@
-# Copyright 2019-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/conftest.py b/tests/conftest.py
index 3060f19..7c6c8c0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # 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/convert_test.py b/tests/convert_test.py
index 8f60078..57669b4 100644
--- a/tests/convert_test.py
+++ b/tests/convert_test.py
@@ -1,4 +1,4 @@
-# Copyright 2020-2024 Quantinuum
+# Copyright Quantinuum
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.