diff --git a/laborious/utils/repository/model_repository.py b/laborious/utils/repository/model_repository.py
index f9e783b..72707c1 100644
--- a/laborious/utils/repository/model_repository.py
+++ b/laborious/utils/repository/model_repository.py
@@ -35,6 +35,7 @@ PREDICTION_COMPRESSED_PATH = 'artifacts/stacking_model.pkl'
 
 INVALID_FLAVOR_MESSAGE = "Invalid flavor. Use 'sklearn' or 'pyfunc' or 'pytorch'."
 
+
 def force_memory_release(logger: Logger):
     gc.collect()
 
@@ -629,7 +630,7 @@ class MLFlowRepository:
             # Aligns data with treated data indexes to get target variable
             aligned_data = data.loc[treated_data.index]
             aligned_series = aligned_data[target_name]
-            retrain_dataset = pd.merge( # NOSONAR
+            retrain_dataset = pd.merge(  # NOSONAR
                 treated_data, aligned_series, left_index=True, right_index=True
             )
         else:
diff --git a/tests/laborious/activities/test_mlflow.py b/tests/laborious/activities/test_mlflow.py
index 3d3a550..662f0ba 100644
--- a/tests/laborious/activities/test_mlflow.py
+++ b/tests/laborious/activities/test_mlflow.py
@@ -200,9 +200,7 @@ async def test_request_predict(mock_max, mock_to_datetime, mock_dataframe, mlflo
     mock_to_datetime.assert_called_once_with(
         mock_dataframe.return_value.__getitem__.return_value, format=DATETIME_FORMAT_WITH_TZ
     )
-    mock_to_datetime.return_value.dt.strftime.assert_called_once_with(
-        DATETIME_FORMAT
-    )
+    mock_to_datetime.return_value.dt.strftime.assert_called_once_with(DATETIME_FORMAT)
 
     mock_to_datetime.assert_called_once_with(
         mock_dataframe.return_value.__getitem__.return_value, format=DATETIME_FORMAT_WITH_TZ
diff --git a/tests/laborious/utils/repository/test_minio_repository.py b/tests/laborious/utils/repository/test_minio_repository.py
index 7883c1c..bebf743 100644
--- a/tests/laborious/utils/repository/test_minio_repository.py
+++ b/tests/laborious/utils/repository/test_minio_repository.py
@@ -67,7 +67,7 @@ def test_close(minio_repository):
 
 
 def test_ensure_bucket_exists_bucket_exists(minio_repository):
-    assert minio_repository.ensure_bucket_exists({}) is True
+    assert minio_repository.ensure_bucket_exists({}) is None
 
     minio_repository.s3_client.head_bucket.assert_called_once_with(Bucket='test')
 
@@ -77,7 +77,7 @@ def test_ensure_bucket_exists_bucket_not_exists_create_success(minio_repository)
         error_response={'Error': {'Code': '404'}}, operation_name='head_bucket'
     )
 
-    assert minio_repository.ensure_bucket_exists({}) is True
+    assert minio_repository.ensure_bucket_exists({}) is None
 
     minio_repository.s3_client.head_bucket.assert_called_once_with(Bucket='test')
     minio_repository.s3_client.create_bucket.assert_called_once_with(Bucket='test')