diff --git a/nailgun/entity_mixins.py b/nailgun/entity_mixins.py
index 60b630a3..d7a56c26 100644
--- a/nailgun/entity_mixins.py
+++ b/nailgun/entity_mixins.py
@@ -1456,7 +1456,7 @@ def to_json_serializable(obj):
 
     if isinstance(obj, dict):
         return {k: to_json_serializable(v) for k, v in obj.items()}
-    elif isinstance(obj, (list, tuple)):
+    elif isinstance(obj, list | tuple):
         return [to_json_serializable(v) for v in obj]
     elif isinstance(obj, datetime):
         return obj.strftime('%Y-%m-%d %H:%M:%S')
diff --git a/tests/test_client.py b/tests/test_client.py
index d5557afc..0de36914 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -1,10 +1,9 @@
 """Unit tests for :mod:`nailgun.client`."""
 import inspect
-from unittest import mock
-from unittest import TestCase
+from unittest import TestCase, mock
 
-import requests
 from fauxfactory import gen_alpha
+import requests
 
 from nailgun import client