diff --git a/scripts-dev/definitions.py b/scripts-dev/definitions.py
index 313860df13..c82ddd9677 100755
--- a/scripts-dev/definitions.py
+++ b/scripts-dev/definitions.py
@@ -140,7 +140,7 @@ if __name__ == "__main__":
definitions = {}
for directory in args.directories:
- for root, dirs, files in os.walk(directory):
+ for root, _, files in os.walk(directory):
for filename in files:
if filename.endswith(".py"):
filepath = os.path.join(root, filename)
diff --git a/scripts-dev/list_url_patterns.py b/scripts-dev/list_url_patterns.py
index 26ad7c67f4..e85420dea8 100755
--- a/scripts-dev/list_url_patterns.py
+++ b/scripts-dev/list_url_patterns.py
@@ -48,7 +48,7 @@ args = parser.parse_args()
for directory in args.directories:
- for root, dirs, files in os.walk(directory):
+ for root, _, files in os.walk(directory):
for filename in files:
if filename.endswith(".py"):
filepath = os.path.join(root, filename)
diff --git a/scripts-dev/mypy_synapse_plugin.py b/scripts-dev/mypy_synapse_plugin.py
index 18df68305b..1217e14874 100644
--- a/scripts-dev/mypy_synapse_plugin.py
+++ b/scripts-dev/mypy_synapse_plugin.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/scripts-dev/sign_json b/scripts-dev/sign_json
index 44553fb79a..4a43d3f2b0 100755
--- a/scripts-dev/sign_json
+++ b/scripts-dev/sign_json
@@ -1,6 +1,5 @@
#!/usr/bin/env python
#
-# -*- coding: utf-8 -*-
# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/scripts-dev/update_database b/scripts-dev/update_database
index 56365e2b58..87f709b6ed 100755
--- a/scripts-dev/update_database
+++ b/scripts-dev/update_database
@@ -1,5 +1,4 @@
#!/usr/bin/env python
-# -*- coding: utf-8 -*-
# Copyright 2019 The Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
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