diff --git a/openiziai/fine_tuning.py b/openiziai/fine_tuning.py
index 59d46ec..d8b4a0b 100644
--- a/openiziai/fine_tuning.py
+++ b/openiziai/fine_tuning.py
@@ -24,9 +24,9 @@ class JobStatus(Enum):
 
 
 class FineTuning(BaseModel):
-    client: OpenAI = Field(default=None, description='Client da OpenAI.')
+    client: OpenAI = Field(description='Client da OpenAI.')
     train_file: Path | str
-    task: Task = Field(default=None)
+    task: Task = Field()
     model: str = Field(default='gpt-3.5-turbo')
     _file_id: str = PrivateAttr(default=None)
     _job_id: str = PrivateAttr(default=None)
diff --git a/openiziai/tools/train_data.py b/openiziai/tools/train_data.py
index 21588f1..ac7ea9a 100644
--- a/openiziai/tools/train_data.py
+++ b/openiziai/tools/train_data.py
@@ -38,11 +38,9 @@ class TrainDataTool(BaseModel):
 
     client: OpenAI = Field(default=None, description='Client da OpenAI.')
     data: DataDict = Field(
-        default=None,
         description='Dados utilizados para construir o dado de treino.',
     )
     task: Task = Field(
-        default=None,
         description='Descrição da task que o modelo deverá executar.',
     )
     model: str = Field(
diff --git a/tests/test_fine_tuning.py b/tests/test_fine_tuning.py
index 47a4294..2ed74a0 100644
--- a/tests/test_fine_tuning.py
+++ b/tests/test_fine_tuning.py
@@ -7,25 +7,34 @@
 from openiziai.fine_tuning import FineTuning
 
 
-def test_size_validation_success(openai_fine_tuning):
+def test_init_invalid_data():
+    with pytest.raises(ValidationError):
+        FineTuning(client=None, task=None)
+
+
+def test_size_validation_success(openai_fine_tuning, valid_task):
     mock_path = MagicMock(spec=Path)
     mock_path.stat.return_value.st_size = 100000  # Menos de 512MB
 
-    fine_tuning = FineTuning(client=openai_fine_tuning, train_file=mock_path)
+    fine_tuning = FineTuning(
+        client=openai_fine_tuning, task=valid_task, train_file=mock_path
+    )
 
     assert fine_tuning.train_file == mock_path
 
 
-def test_size_validation_failure(openai_fine_tuning):
+def test_size_validation_failure(openai_fine_tuning, valid_task):
     mock_path = MagicMock(spec=Path)
     mock_path.stat.return_value.st_size = 600000000
 
     with pytest.raises(ValidationError):
-        FineTuning(client=openai_fine_tuning, train_file=mock_path)
+        FineTuning(
+            client=openai_fine_tuning, task=valid_task, train_file=mock_path
+        )
 
 
 def test_upload_file_to_openai(fine_tuning):
-    with patch('builtins.open', mock_open(read_data="data")):
+    with patch('builtins.open', mock_open(read_data='data')):
         fine_tuning.upload_file_to_openai()
 
         assert fine_tuning.file_id == 'file-id'