diff --git a/tests/test_serializer.py b/tests/test_serializer.py
index 3e33bcb3..f88ae75e 100644
--- a/tests/test_serializer.py
+++ b/tests/test_serializer.py
@@ -1,4 +1,9 @@
-from datetime import UTC, datetime
+try:
+    from datetime import UTC, datetime
+except ImportError:
+    from datetime import datetime, timezone
+
+    UTC = timezone.utc
 
 import logistro
 import numpy as np
@@ -25,10 +30,12 @@ async def test_de_serialize():
     message = wire.serialize(data)
     assert message == expected_message
     obj = wire.deserialize(message)
-    for o, t in zip(obj, converted_type, strict=False):
+    assert len(obj) == len(converted_type)
+    for o, t in zip(obj, converted_type):
         assert isinstance(o, t)
     message_np = wire.serialize(np.array(data))
     assert message_np == expected_message
     obj_np = wire.deserialize(message_np)
-    for o, t in zip(obj_np, converted_type, strict=False):
+    assert len(obj_np) == len(converted_type)
+    for o, t in zip(obj_np, converted_type):
         assert isinstance(o, t)