diff --git a/scripts-dev/check_locked_deps_have_sdists.py b/scripts-dev/check_locked_deps_have_sdists.py
index ce5001c125..cabe3b8de1 100755
--- a/scripts-dev/check_locked_deps_have_sdists.py
+++ b/scripts-dev/check_locked_deps_have_sdists.py
@@ -2,6 +2,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/scripts-dev/check_pydantic_models.py b/scripts-dev/check_pydantic_models.py
index 19536167ac..9e67375b6a 100755
--- a/scripts-dev/check_pydantic_models.py
+++ b/scripts-dev/check_pydantic_models.py
@@ -2,6 +2,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2022 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/scripts-dev/federation_client.py b/scripts-dev/federation_client.py
index dee26cb3cb..4c758e5424 100755
--- a/scripts-dev/federation_client.py
+++ b/scripts-dev/federation_client.py
@@ -2,6 +2,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2015, 2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/scripts-dev/mypy_synapse_plugin.py b/scripts-dev/mypy_synapse_plugin.py
index 073425e21f..877b831751 100644
--- a/scripts-dev/mypy_synapse_plugin.py
+++ b/scripts-dev/mypy_synapse_plugin.py
@@ -1,6 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/scripts-dev/release.py b/scripts-dev/release.py
index cb315f4444..491848903b 100755
--- a/scripts-dev/release.py
+++ b/scripts-dev/release.py
@@ -2,6 +2,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
diff --git a/scripts-dev/schema_versions.py b/scripts-dev/schema_versions.py
index 5fd73251cd..5a79a43355 100755
--- a/scripts-dev/schema_versions.py
+++ b/scripts-dev/schema_versions.py
@@ -1,5 +1,6 @@
#!/usr/bin/env python
# Copyright 2023 The Matrix.org Foundation C.I.C.
+# Copyright 2023 The Matrix.org Foundation C.I.C.
#
# 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/scripts-dev/sign_json.py b/scripts-dev/sign_json.py
index 5012b84cb5..14aacf9382 100755
--- a/scripts-dev/sign_json.py
+++ b/scripts-dev/sign_json.py
@@ -2,6 +2,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
+# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
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