diff --git a/coveo-functools/README.md b/coveo-functools/README.md
index d7a9515..db314ab 100644
--- a/coveo-functools/README.md
+++ b/coveo-functools/README.md
@@ -37,7 +37,7 @@ class Person:
     social_number: Optional[int] = None
 
 # the deserializer is used directly to receive a list of Person instances
-response = flex.deserialize(json.load(), hint=List[Person])
+response = flex.deserialize(json.load(), hint=List[Person], errors='raise')
 ```
 
 Automatic usage example:
@@ -229,7 +229,7 @@ class WithDateTime:
   
 
 timestamp = datetime.utcnow()
-instance = flex.deserialize({"timestamp": timestamp.isoformat()}, hint=WithDateTime)
+instance = flex.deserialize({"timestamp": timestamp.isoformat()}, hint=WithDateTime, errors='raise')
 assert instance.timestamp == timestamp
 assert isinstance(instance.timestamp, datetime)
 ```
@@ -278,7 +278,7 @@ class Parent:
 
 
 meta = SerializationMetadata.from_instance(Parent(Concrete()))
-parent = deserialize({"nested": {}}, hint=meta)
+parent = deserialize({"nested": {}}, hint=meta, errors='raise')
 assert isinstance(parent.nested, Concrete)
 ```
 
@@ -397,8 +397,8 @@ payload = {
     "Id": "GgfhAs89876yh.z"
 }
 
-transaction = flex.deserialize(payload, hint=Transaction)
-all_transactions = flex.deserialize([payload, payload], hint=List[Transaction])
+transaction = flex.deserialize(payload, hint=Transaction, errors='raise')
+all_transactions = flex.deserialize([payload, payload], hint=List[Transaction], errors='raise')
 ```
 
 Interesting details:
diff --git a/coveo-functools/coveo_functools/flex/deserializer.py b/coveo-functools/coveo_functools/flex/deserializer.py
index 8489824..8e8971e 100644
--- a/coveo-functools/coveo_functools/flex/deserializer.py
+++ b/coveo-functools/coveo_functools/flex/deserializer.py
@@ -441,7 +441,7 @@ def _deserialize_with_metadata(
         # or an instance thereof.
         # Here, we take a shortcut to deserialize `value` into an instance of `SerializationMetadata`.
         # This happens when flex is also used to serialize the metadata headers.
-        return hint(**convert_kwargs_for_unpacking(value, hint=hint))  # type: ignore[misc]
+        return hint(**convert_kwargs_for_unpacking(value, hint=hint, errors=errors))  # type: ignore[misc]
 
     root_type = hint.import_type()
 
@@ -462,7 +462,7 @@ def _deserialize_with_metadata(
     if isclass(root_type) and isinstance(value, dict):
         # typical case of unpacking value into an instance of the root type.
         return root_type(
-            **convert_kwargs_for_unpacking(value, hint=hint)
+            **convert_kwargs_for_unpacking(value, hint=hint, errors=errors)
         )  # it's magic!  # type: ignore[no-any-return]
 
     if root_type is not SerializationMetadata:
diff --git a/coveo-functools/poetry.lock b/coveo-functools/poetry.lock
index 4c8d549..d1afda0 100644
--- a/coveo-functools/poetry.lock
+++ b/coveo-functools/poetry.lock
@@ -452,6 +452,7 @@ files = [
     {file = "PyYAML-6.0.1-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:69b023b2b4daa7548bcfbd4aa3da05b3a74b772db9e23b982788168117739938"},
     {file = "PyYAML-6.0.1-cp310-cp310-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:81e0b275a9ecc9c0c0c07b4b90ba548307583c125f54d5b6946cfee6360c733d"},
     {file = "PyYAML-6.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ba336e390cd8e4d1739f42dfe9bb83a3cc2e80f567d8805e11b46f4a943f5515"},
+    {file = "PyYAML-6.0.1-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:326c013efe8048858a6d312ddd31d56e468118ad4cdeda36c719bf5bb6192290"},
     {file = "PyYAML-6.0.1-cp310-cp310-win32.whl", hash = "sha256:bd4af7373a854424dabd882decdc5579653d7868b8fb26dc7d0e99f823aa5924"},
     {file = "PyYAML-6.0.1-cp310-cp310-win_amd64.whl", hash = "sha256:fd1592b3fdf65fff2ad0004b5e363300ef59ced41c2e6b3a99d4089fa8c5435d"},
     {file = "PyYAML-6.0.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:6965a7bc3cf88e5a1c3bd2e0b5c22f8d677dc88a455344035f03399034eb3007"},
@@ -459,8 +460,15 @@ files = [
     {file = "PyYAML-6.0.1-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:42f8152b8dbc4fe7d96729ec2b99c7097d656dc1213a3229ca5383f973a5ed6d"},
     {file = "PyYAML-6.0.1-cp311-cp311-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:062582fca9fabdd2c8b54a3ef1c978d786e0f6b3a1510e0ac93ef59e0ddae2bc"},
     {file = "PyYAML-6.0.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d2b04aac4d386b172d5b9692e2d2da8de7bfb6c387fa4f801fbf6fb2e6ba4673"},
+    {file = "PyYAML-6.0.1-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:e7d73685e87afe9f3b36c799222440d6cf362062f78be1013661b00c5c6f678b"},
     {file = "PyYAML-6.0.1-cp311-cp311-win32.whl", hash = "sha256:1635fd110e8d85d55237ab316b5b011de701ea0f29d07611174a1b42f1444741"},
     {file = "PyYAML-6.0.1-cp311-cp311-win_amd64.whl", hash = "sha256:bf07ee2fef7014951eeb99f56f39c9bb4af143d8aa3c21b1677805985307da34"},
+    {file = "PyYAML-6.0.1-cp312-cp312-macosx_10_9_x86_64.whl", hash = "sha256:855fb52b0dc35af121542a76b9a84f8d1cd886ea97c84703eaa6d88e37a2ad28"},
+    {file = "PyYAML-6.0.1-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:40df9b996c2b73138957fe23a16a4f0ba614f4c0efce1e9406a184b6d07fa3a9"},
+    {file = "PyYAML-6.0.1-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6c22bec3fbe2524cde73d7ada88f6566758a8f7227bfbf93a408a9d86bcc12a0"},
+    {file = "PyYAML-6.0.1-cp312-cp312-musllinux_1_1_x86_64.whl", hash = "sha256:8d4e9c88387b0f5c7d5f281e55304de64cf7f9c0021a3525bd3b1c542da3b0e4"},
+    {file = "PyYAML-6.0.1-cp312-cp312-win32.whl", hash = "sha256:d483d2cdf104e7c9fa60c544d92981f12ad66a457afae824d146093b8c294c54"},
+    {file = "PyYAML-6.0.1-cp312-cp312-win_amd64.whl", hash = "sha256:0d3304d8c0adc42be59c5f8a4d9e3d7379e6955ad754aa9d6ab7a398b59dd1df"},
     {file = "PyYAML-6.0.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:50550eb667afee136e9a77d6dc71ae76a44df8b3e51e41b77f6de2932bfe0f47"},
     {file = "PyYAML-6.0.1-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:1fe35611261b29bd1de0070f0b2f47cb6ff71fa6595c077e42bd0c419fa27b98"},
     {file = "PyYAML-6.0.1-cp36-cp36m-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:704219a11b772aea0d8ecd7058d0082713c3562b4e271b849ad7dc4a5c90c13c"},
@@ -477,6 +485,7 @@ files = [
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a0cd17c15d3bb3fa06978b4e8958dcdc6e0174ccea823003a106c7d4d7899ac5"},
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:28c119d996beec18c05208a8bd78cbe4007878c6dd15091efb73a30e90539696"},
     {file = "PyYAML-6.0.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7e07cbde391ba96ab58e532ff4803f79c4129397514e1413a7dc761ccd755735"},
+    {file = "PyYAML-6.0.1-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:49a183be227561de579b4a36efbb21b3eab9651dd81b1858589f796549873dd6"},
     {file = "PyYAML-6.0.1-cp38-cp38-win32.whl", hash = "sha256:184c5108a2aca3c5b3d3bf9395d50893a7ab82a38004c8f61c258d4428e80206"},
     {file = "PyYAML-6.0.1-cp38-cp38-win_amd64.whl", hash = "sha256:1e2722cc9fbb45d9b87631ac70924c11d3a401b2d7f410cc0e3bbf249f2dca62"},
     {file = "PyYAML-6.0.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:9eb6caa9a297fc2c2fb8862bc5370d0303ddba53ba97e71f08023b6cd73d16a8"},
@@ -484,6 +493,7 @@ files = [
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:5773183b6446b2c99bb77e77595dd486303b4faab2b086e7b17bc6bef28865f6"},
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:b786eecbdf8499b9ca1d697215862083bd6d2a99965554781d0d8d1ad31e13a0"},
     {file = "PyYAML-6.0.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:bc1bf2925a1ecd43da378f4db9e4f799775d6367bdb94671027b73b393a7c42c"},
+    {file = "PyYAML-6.0.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:04ac92ad1925b2cff1db0cfebffb6ffc43457495c9b3c39d3fcae417d7125dc5"},
     {file = "PyYAML-6.0.1-cp39-cp39-win32.whl", hash = "sha256:faca3bdcf85b2fc05d06ff3fbc1f83e1391b3e724afa3feba7d13eeab355484c"},
     {file = "PyYAML-6.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:510c9deebc5c0225e8c96813043e62b680ba2f9c50a08d3724c7f28a747d1486"},
     {file = "PyYAML-6.0.1.tar.gz", hash = "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43"},
diff --git a/coveo-functools/tests_functools/test_flex_adapters.py b/coveo-functools/tests_functools/test_flex_adapters.py
index 7179f36..2c89d14 100644
--- a/coveo-functools/tests_functools/test_flex_adapters.py
+++ b/coveo-functools/tests_functools/test_flex_adapters.py
@@ -49,7 +49,7 @@ class Parent:
 
 def test_flex_raise_on_abstract() -> None:
     with pytest.raises(UnsupportedAnnotation):
-        deserialize({}, hint=Abstract)
+        deserialize({}, hint=Abstract, errors="raise")
 
 
 @parametrize("implementation_class", (Implementation, DataclassImplementation))
@@ -58,7 +58,7 @@ def adapter(value: Any) -> Type:
         return implementation_class
 
     register_subclass_adapter(Abstract, adapter)
-    parent = deserialize({"test": {}}, hint=Parent)
+    parent = deserialize({"test": {}}, hint=Parent, errors="raise")
     assert isinstance(parent.test, implementation_class)
 
 
@@ -71,7 +71,7 @@ class Nested:
         nested: Parent
 
     register_subclass_adapter(Abstract, adapter)
-    instance = deserialize({"nested": {"test": {}}}, hint=Nested)
+    instance = deserialize({"nested": {"test": {}}}, hint=Nested, errors="raise")
     assert isinstance(instance.nested.test, Implementation)
 
 
@@ -82,7 +82,11 @@ def adapter(value: Any) -> Type:
         return List[str]
 
     register_subclass_adapter(Abstract, adapter)
-    assert deserialize({"test": ["a", "b", "c"]}, hint=Parent).test == ["a", "b", "c"]
+    assert deserialize({"test": ["a", "b", "c"]}, hint=Parent, errors="raise").test == [
+        "a",
+        "b",
+        "c",
+    ]
 
 
 def test_deserialize_any_adapter() -> None:
@@ -101,14 +105,14 @@ def abstract_adapter(value: Any) -> TypeHint:
     register_subclass_adapter(Any, any_adapter)
     register_subclass_adapter(Abstract, abstract_adapter)
 
-    instance: Any = deserialize([{}, {}, {}], hint=Any)
+    instance: Any = deserialize([{}, {}, {}], hint=Any, errors="raise")
     assert (
         isinstance(instance, list)
         and instance
         and all(isinstance(item, Implementation) for item in instance)
     )
 
-    instance = deserialize({"item1": {}, "item2": {}}, hint=Any)
+    instance = deserialize({"item1": {}, "item2": {}}, hint=Any, errors="raise")
     assert isinstance(instance, dict) and instance
     assert isinstance(instance["item1"], Implementation)
     assert isinstance(instance["item2"], Implementation)
@@ -131,7 +135,7 @@ def abstract_adapter(value: Any) -> TypeHint:
 
     # the payload will be mutated
     payload: Dict[str, Any] = {}
-    instance = deserialize(payload, hint=Parent)
+    instance = deserialize(payload, hint=Parent, errors="raise")
     assert "test" in payload
     assert isinstance(instance.test, Implementation)
     assert instance.test.value == "success"
@@ -143,7 +147,7 @@ class TestFactory:
 
     @classmethod
     def factory(cls, raw: Dict[str, str]) -> TestFactory:
-        return deserialize(raw, hint=TestFactory)
+        return deserialize(raw, hint=TestFactory, errors="raise")
 
 
 def test_deserialize_adapter_factory_classmethod() -> None:
@@ -155,7 +159,7 @@ def factory_adapter(value: Any) -> TypeHint:
     register_subclass_adapter(TestFactory, factory_adapter)
 
     payload: Dict[str, Any] = {"raw": {"value": "success"}}
-    assert deserialize(payload, hint=TestFactory).value == "success"
+    assert deserialize(payload, hint=TestFactory, errors="raise").value == "success"
 
 
 @dataclass
@@ -174,7 +178,7 @@ def test_deserialize_adapter_factory_function() -> None:
     """Tests the factory feature, which expects the instance to be returned instead of the type."""
     test_datetime = datetime.utcnow()
     payload: Dict[str, Any] = {"value": test_datetime.isoformat()}
-    assert deserialize(payload, hint=TestDatetimeFactory).value == test_datetime
+    assert deserialize(payload, hint=TestDatetimeFactory, errors="raise").value == test_datetime
 
 
 def test_deserialize_with_meta_and_factory() -> None:
@@ -183,6 +187,7 @@ def test_deserialize_with_meta_and_factory() -> None:
     instance = TestDatetimeFactory(value=timestamp)
     meta = SerializationMetadata.from_instance(instance)
     deserialized = cast(
-        TestDatetimeFactory, deserialize({"value": timestamp.isoformat()}, hint=meta)
+        TestDatetimeFactory,
+        deserialize({"value": timestamp.isoformat()}, hint=meta, errors="raise"),
     )
     assert deserialized.value == timestamp
diff --git a/coveo-functools/tests_functools/test_flex_deserializer.py b/coveo-functools/tests_functools/test_flex_deserializer.py
index 797fa37..43007ad 100644
--- a/coveo-functools/tests_functools/test_flex_deserializer.py
+++ b/coveo-functools/tests_functools/test_flex_deserializer.py
@@ -78,7 +78,7 @@ class MockIntEnum(int, Enum):
     ),
 )
 def test_deserialize_to_list(hint: Any, payload: Any, expected: Any) -> None:
-    assert deserialize(payload, hint=hint) == expected
+    assert deserialize(payload, hint=hint, errors="raise") == expected
 
 
 @UnitTest
@@ -86,7 +86,7 @@ def test_deserialize_unions_passthrough() -> None:
     """Anything from the json types will be given back without checking; this allows unions of base types."""
     union = Union[JSON_TYPES]  # type: ignore[valid-type]
 
-    assert deserialize(DEFAULT_VALUE, hint=union) == DEFAULT_VALUE
+    assert deserialize(DEFAULT_VALUE, hint=union, errors="raise") == DEFAULT_VALUE
 
 
 @UnitTest
@@ -96,7 +96,9 @@ def test_deserialize_unions_limited() -> None:
     This may change in the future.
     """
     with pytest.raises(UnsupportedAnnotation):
-        assert deserialize(DEFAULT_VALUE, hint=Union[str, MockType]) == DEFAULT_VALUE
+        assert (
+            deserialize(DEFAULT_VALUE, hint=Union[str, MockType], errors="raise") == DEFAULT_VALUE
+        )
 
 
 @UnitTest
@@ -116,7 +118,7 @@ def test_deserialize_thing_or_list_of_things(hint: Type, payload: Any, expected:
     Some APIs will return a single map if there's one object, else a list of them.
     Such objects must be annotated with Union[Thing, List[Thing]].
     """
-    assert deserialize(payload, hint=hint) == expected
+    assert deserialize(payload, hint=hint, errors="raise") == expected
 
 
 @UnitTest
@@ -133,7 +135,7 @@ def test_deserialize_thing_or_list_of_things(hint: Type, payload: Any, expected:
 )
 def test_deserialize_dict(hint: Type) -> None:
     """We don't do much with'em, but they gotta work!"""
-    assert deserialize(DEFAULT_PAYLOAD, hint=hint) == DEFAULT_PAYLOAD
+    assert deserialize(DEFAULT_PAYLOAD, hint=hint, errors="raise") == DEFAULT_PAYLOAD
 
 
 @UnitTest
@@ -146,7 +148,7 @@ def test_deserialize_dict(hint: Type) -> None:
     ),
 )
 def test_deserialize_dict_with_custom_value_type(hint: Any) -> None:
-    assert deserialize(DEFAULT_MAP_PAYLOAD, hint=hint) == DEFAULT_MAP_MOCK
+    assert deserialize(DEFAULT_MAP_PAYLOAD, hint=hint, errors="raise") == DEFAULT_MAP_MOCK
 
 
 @UnitTest
@@ -184,14 +186,14 @@ def test_deserialize_dict_with_custom_value_type(hint: Any) -> None:
     ),
 )
 def test_deserialize_dict_complex(hint: Any, payload: Any, expected: Any) -> None:
-    assert deserialize(payload, hint=hint) == expected
+    assert deserialize(payload, hint=hint, errors="raise") == expected
 
 
 @UnitTest
 def test_deserialize_dict_invalid_union() -> None:
     """Make sure the union rules are respected in the dict value annotation."""
     with pytest.raises(UnsupportedAnnotation):
-        _ = deserialize(DEFAULT_PAYLOAD, hint=Dict[str, Union[str, MockType]])
+        _ = deserialize(DEFAULT_PAYLOAD, hint=Dict[str, Union[str, MockType]], errors="raise")
 
 
 @UnitTest
@@ -214,7 +216,7 @@ def test_deserialize_dict_invalid_union() -> None:
 def test_deserialize_enum_with_data_type(
     value: str, hint: Union[Type[MockEnum], Type[MockIntEnum], Type[MockStrEnum]]
 ) -> None:
-    assert deserialize(value, hint=hint) is hint.TestKey
+    assert deserialize(value, hint=hint, errors="raise") is hint.TestKey
 
 
 @parametrize(
@@ -251,12 +253,16 @@ def test_deserialize_enum_nested() -> None:
     class SomeClass:
         test: MockEnum
 
-    assert deserialize({"Test": "test.key"}, hint=SomeClass).test is MockEnum.TestKey
+    assert (
+        deserialize({"Test": "test.key"}, hint=SomeClass, errors="raise").test is MockEnum.TestKey
+    )
 
 
 @UnitTest
 def test_deserialize_enum_list() -> None:
-    assert deserialize(["test-value", "TestKey", "otherkey"], hint=List[MockEnum]) == [
+    assert deserialize(
+        ["test-value", "TestKey", "otherkey"], hint=List[MockEnum], errors="raise"
+    ) == [
         MockEnum.TestKey,
         MockEnum.TestKey,
         MockEnum.OtherKey,
@@ -270,8 +276,8 @@ class SomeEnum(Enum):
         Task = Job
         Status = "status"
 
-    assert deserialize("job", hint=SomeEnum) is SomeEnum.Job
-    assert deserialize("task", hint=SomeEnum) is SomeEnum.Task
+    assert deserialize("job", hint=SomeEnum, errors="raise") is SomeEnum.Job
+    assert deserialize("task", hint=SomeEnum, errors="raise") is SomeEnum.Task
     assert SomeEnum.Job is SomeEnum.Task  # it's the same picture.
 
 
@@ -282,7 +288,7 @@ class SubclassImmutable(immutable_type):  # type: ignore[valid-type,misc]
         def builtin_type(self) -> Type:
             return immutable_type
 
-    value = deserialize(1, hint=SubclassImmutable)
+    value = deserialize(1, hint=SubclassImmutable, errors="raise")
     assert isinstance(value, immutable_type)
     assert isinstance(value, SubclassImmutable)
     assert value.builtin_type is immutable_type
@@ -369,36 +375,42 @@ def fn(value: str) -> str:
 
     def correct_annotations() -> None:
         """cases that correctly follow annotations"""
-        assert deserialize(DEFAULT_PAYLOAD, hint=MockType).value == DEFAULT_VALUE
-        assert deserialize([DEFAULT_PAYLOAD], hint=List[MockType])[0].value == DEFAULT_VALUE
-        assert deserialize(DEFAULT_PAYLOAD, hint=Dict[str, Any])["value"] == DEFAULT_VALUE
-        assert deserialize(fn, hint=fn)(value=DEFAULT_VALUE) == DEFAULT_VALUE
+        assert deserialize(DEFAULT_PAYLOAD, hint=MockType, errors="raise").value == DEFAULT_VALUE
+        assert (
+            deserialize([DEFAULT_PAYLOAD], hint=List[MockType], errors="raise")[0].value
+            == DEFAULT_VALUE
+        )
+        assert (
+            deserialize(DEFAULT_PAYLOAD, hint=Dict[str, Any], errors="raise")["value"]
+            == DEFAULT_VALUE
+        )
+        assert deserialize(fn, hint=fn, errors="ignore")(value=DEFAULT_VALUE) == DEFAULT_VALUE
 
     correct_annotations()
 
     def broken_annotations() -> None:  # noqa
         """we don't execute this one, because it would fail."""
         # mypy sees that we may not get a list
-        _ = deserialize(DEFAULT_PAYLOAD, hint=Union[List[MockType], MockType])[0].value  # type: ignore[index]
+        _ = deserialize(DEFAULT_PAYLOAD, hint=Union[List[MockType], MockType], errors="raise")[0].value  # type: ignore[index]
 
         # ...same as above, reversed.
-        _ = deserialize(DEFAULT_PAYLOAD, hint=Union[List[MockType], MockType]).value  # type: ignore[attr-defined]
+        _ = deserialize(DEFAULT_PAYLOAD, hint=Union[List[MockType], MockType], errors="raise").value  # type: ignore[attr-defined]
 
         # mypy rightfully complains about None not having a `.value`
-        _ = deserialize(DEFAULT_PAYLOAD, hint=Optional[MockType]).value  # type: ignore[attr-defined]
+        _ = deserialize(DEFAULT_PAYLOAD, hint=Optional[MockType], errors="raise").value  # type: ignore[attr-defined]
 
         # mypy rightfully complains about MockType not having a `.name`
-        _ = deserialize(DEFAULT_PAYLOAD, hint=Optional[MockType]).name  # type: ignore[attr-defined]
+        _ = deserialize(DEFAULT_PAYLOAD, hint=Optional[MockType], errors="raise").name  # type: ignore[attr-defined]
 
         def test_return() -> str:  # noqa
             # mypy rightfully complains about returning `Any` instead of str
-            return deserialize(DEFAULT_PAYLOAD, hint=MockType).name  # type: ignore[attr-defined,no-any-return]
+            return deserialize(DEFAULT_PAYLOAD, hint=MockType, errors="raise").name  # type: ignore[attr-defined,no-any-return]
 
         # mypy sees that fn accepts a str, not an int
-        _ = deserialize(fn, hint=fn)(fn=1)  # type:ignore[call-arg]
+        _ = deserialize(fn, hint=fn, errors="raise")(fn=1)  # type:ignore[call-arg]
 
         # mypy sees that fn returns a str, not an int
-        _ = deserialize(fn, hint=fn)(value="") / 2  # type: ignore[operator]
+        _ = deserialize(fn, hint=fn, errors="raise")(value="") / 2  # type: ignore[operator]
 
 
 # the type of the payload doesn't fit the hint
diff --git a/coveo-functools/tests_functools/test_flex_serializer.py b/coveo-functools/tests_functools/test_flex_serializer.py
index 1a55cd2..e34567b 100644
--- a/coveo-functools/tests_functools/test_flex_serializer.py
+++ b/coveo-functools/tests_functools/test_flex_serializer.py
@@ -56,11 +56,11 @@ class MockOptionalList:
 
 def test_serialization_metadata() -> None:
     meta = SerializationMetadata.from_instance(MockWithAbstract(MockSubClass("test")))
-    assert deserialize({"extra": {"value": "test"}}, hint=meta).extra.value == "test"  # type: ignore[attr-defined]
+    assert deserialize({"extra": {"value": "test"}}, hint=meta, errors="raise").extra.value == "test"  # type: ignore[attr-defined]
 
     # it cannot work without the meta because of the abstract class
     with pytest.raises(Exception):
-        deserialize({"extra": {"value": "test"}}, hint=MockWithAbstract)
+        deserialize({"extra": {"value": "test"}}, hint=MockWithAbstract, errors="raise")
 
 
 def test_serialization_recursive() -> None:
@@ -72,7 +72,7 @@ def test_serialization_recursive() -> None:
     meta = SerializationMetadata.from_instance(
         MockWithNested(MockWithAbstract(MockSubClass("test")))
     )
-    assert deserialize(payload, hint=meta).root.extra.value == "test"  # type: ignore[attr-defined]
+    assert deserialize(payload, hint=meta, errors="raise").root.extra.value == "test"  # type: ignore[attr-defined]
 
 
 def test_serialization_enum() -> None:
@@ -80,7 +80,7 @@ def test_serialization_enum() -> None:
     instance = MockSubClass("test", MockEnum.Value)
     meta = SerializationMetadata.from_instance(instance)
     payload = {"value": "test", "enum_test": "Value"}
-    assert deserialize(payload, hint=meta).enum_test is MockEnum.Value  # type: ignore[attr-defined]
+    assert deserialize(payload, hint=meta, errors="raise").enum_test is MockEnum.Value  # type: ignore[attr-defined]
 
 
 def test_serialization_abstract_in_list() -> None:
@@ -88,9 +88,11 @@ def test_serialization_abstract_in_list() -> None:
     meta = SerializationMetadata.from_instance(lst)
 
     with pytest.raises(Exception):
-        deserialize([{"value": "first"}, {"value": "second"}], hint=List[AbstractClass])
+        deserialize(
+            [{"value": "first"}, {"value": "second"}], hint=List[AbstractClass], errors="raise"
+        )
 
-    result = deserialize([{"value": "first"}, {"value": "second"}], hint=meta)
+    result = deserialize([{"value": "first"}, {"value": "second"}], hint=meta, errors="raise")
     assert result[0].value == "first" and result[1].value == "second"  # type: ignore[index]
     assert isinstance(result[0], MockSubClass)  # type: ignore[index]
     assert isinstance(result[1], MockSubClass2)  # type: ignore[index]
@@ -103,9 +105,11 @@ def test_serialization_abstract_in_dict() -> None:
     meta = SerializationMetadata.from_instance(dct)
 
     with pytest.raises(Exception):
-        deserialize(payload, hint=Dict[str, AbstractClass])
+        deserialize(payload, hint=Dict[str, AbstractClass], errors="raise")
 
-    result = deserialize({"first": {"value": "first"}, "second": {"value": "second"}}, hint=meta)
+    result = deserialize(
+        {"first": {"value": "first"}, "second": {"value": "second"}}, hint=meta, errors="raise"
+    )
     assert result["first"].value == "first" and result["second"].value == "second"  # type: ignore[index]
     assert isinstance(result["first"], MockSubClass)  # type: ignore[index]
     assert isinstance(result["second"], MockSubClass2)  # type: ignore[index]
@@ -114,14 +118,14 @@ def test_serialization_abstract_in_dict() -> None:
 def test_serialization_none_in_list() -> None:
     lst = MockOptionalList([1, 2, None, 4])
     meta = SerializationMetadata.from_instance(lst)
-    result = deserialize({"value": [1, 2, None, 4]}, hint=meta)
+    result = deserialize({"value": [1, 2, None, 4]}, hint=meta, errors="raise")
     assert result.value == [1, 2, None, 4]  # type: ignore[attr-defined]
 
 
 def test_serialization_none_in_custom_object() -> None:
     obj = MockOptionalList(None)
     meta = SerializationMetadata.from_instance(obj)
-    result = deserialize({"value": None}, hint=meta)
+    result = deserialize({"value": None}, hint=meta, errors="raise")
     assert result.value is None  # type: ignore[attr-defined]
 
 
@@ -130,5 +134,5 @@ def test_serialization_can_serialize_serialization_metadata() -> None:
     instance = SerializationMetadata("patate", "poire")
     meta = SerializationMetadata.from_instance(instance)
     payload = asdict(instance)
-    assert deserialize(payload, hint=SerializationMetadata).module_name == "patate"
-    assert deserialize(payload, hint=meta).module_name == "patate"
+    assert deserialize(payload, hint=SerializationMetadata, errors="raise").module_name == "patate"
+    assert deserialize(payload, hint=meta, errors="raise").module_name == "patate"