diff --git a/airbyte-cdk/python/airbyte_cdk/sources/abstract_source.py b/airbyte-cdk/python/airbyte_cdk/sources/abstract_source.py
index a9efc45fb21b..4869d54d108f 100644
--- a/airbyte-cdk/python/airbyte_cdk/sources/abstract_source.py
+++ b/airbyte-cdk/python/airbyte_cdk/sources/abstract_source.py
@@ -243,7 +243,8 @@ def _read_incremental(
             has_slices = True
             if logger.isEnabledFor(logging.DEBUG):
                 yield AirbyteMessage(
-                    type=MessageType.LOG, log=AirbyteLogMessage(level=Level.INFO, message=f"{self.SLICE_LOG_PREFIX}{json.dumps(_slice)}")
+                    type=MessageType.LOG,
+                    log=AirbyteLogMessage(level=Level.INFO, message=f"{self.SLICE_LOG_PREFIX}{json.dumps(_slice, default=str)}"),
                 )
             records = stream_instance.read_records(
                 sync_mode=SyncMode.incremental,
@@ -295,7 +296,8 @@ def _read_full_refresh(
         for _slice in slices:
             if logger.isEnabledFor(logging.DEBUG):
                 yield AirbyteMessage(
-                    type=MessageType.LOG, log=AirbyteLogMessage(level=Level.INFO, message=f"{self.SLICE_LOG_PREFIX}{json.dumps(_slice)}")
+                    type=MessageType.LOG,
+                    log=AirbyteLogMessage(level=Level.INFO, message=f"{self.SLICE_LOG_PREFIX}{json.dumps(_slice, default=str)}"),
                 )
             record_data_or_messages = stream_instance.read_records(
                 stream_slice=_slice,
diff --git a/airbyte-cdk/python/unit_tests/sources/test_abstract_source.py b/airbyte-cdk/python/unit_tests/sources/test_abstract_source.py
index b7747bc5f0d0..43081fa9dce2 100644
--- a/airbyte-cdk/python/unit_tests/sources/test_abstract_source.py
+++ b/airbyte-cdk/python/unit_tests/sources/test_abstract_source.py
@@ -3,6 +3,7 @@
 #
 
 import copy
+import datetime
 import logging
 from collections import defaultdict
 from typing import Any, Callable, Dict, Iterable, List, Mapping, MutableMapping, Optional, Tuple, Union
@@ -331,11 +332,17 @@ def test_valid_full_refresh_read_with_slices(mocker):
     assert expected == messages
 
 
-def test_read_full_refresh_with_slices_sends_slice_messages(mocker):
+@pytest.mark.parametrize(
+    "slices",
+    [
+        [{"1": "1"}, {"2": "2"}],
+        [{"date": datetime.date(year=2023, month=1, day=1)}, {"date": datetime.date(year=2023, month=1, day=1)}]
+    ]
+)
+def test_read_full_refresh_with_slices_sends_slice_messages(mocker, slices):
     """Given the logger is debug and a full refresh, AirbyteMessages are sent for slices"""
     debug_logger = logging.getLogger("airbyte.debug")
     debug_logger.setLevel(logging.DEBUG)
-    slices = [{"1": "1"}, {"2": "2"}]
     stream = MockStream(
         [({"sync_mode": SyncMode.full_refresh, "stream_slice": s}, [s]) for s in slices],
         name="s1",