diff --git a/sinch/core/deserializers.py b/sinch/core/deserializers.py
index 8ca137c8..f81e5fd4 100644
--- a/sinch/core/deserializers.py
+++ b/sinch/core/deserializers.py
@@ -2,4 +2,11 @@
 
 
 def timestamp_to_datetime_in_utc_deserializer(timestamp: str):
+    """
+    Older Python versions (like 3.9) do not support "Z" as a TZ information.
+    One needs to use '+00:00' to represent UTC tz.
+    """
+    if timestamp.endswith("Z"):
+        timestamp = timestamp[:-1]
+
     return datetime.fromisoformat(timestamp + "+00:00")
diff --git a/tests/unit/test_serdes.py b/tests/unit/test_serdes.py
index 9b15ba85..d8e16f44 100644
--- a/tests/unit/test_serdes.py
+++ b/tests/unit/test_serdes.py
@@ -63,3 +63,9 @@ def test_timestamp_to_datetime_in_utc_deserializer():
     datetime_in_utc = timestamp_to_datetime_in_utc_deserializer("2024-02-15T13:01:29")
     assert isinstance(datetime_in_utc, datetime.datetime)
     assert datetime_in_utc.tzinfo == datetime.timezone.utc
+
+
+def test_timestamp_to_datetime_in_utc_deserializer_with_added_tz():
+    datetime_in_utc = timestamp_to_datetime_in_utc_deserializer("2024-02-15T13:01:29Z")
+    assert isinstance(datetime_in_utc, datetime.datetime)
+    assert datetime_in_utc.tzinfo == datetime.timezone.utc