diff --git a/laborious/activities/mlflow.py b/laborious/activities/mlflow.py
index f11a397..5f5b12c 100644
--- a/laborious/activities/mlflow.py
+++ b/laborious/activities/mlflow.py
@@ -154,7 +154,7 @@ class MLFlow(BaseActivity):
         data.columns.name = None
 
         self.debug("Processed input data:", metadata)
-        self.debug(data.to_csv('data.csv'), metadata)
+        self.debug(data.to_string(), metadata)
 
         # Request transformation from MLFlow model
         response_data = self.model_monitoring_repository.transform(
@@ -162,7 +162,7 @@ class MLFlow(BaseActivity):
         )
 
         self.debug("Transform raw response data:", metadata)
-        self.debug(response_data, metadata)
+        self.debug(f"{response_data}", metadata)
 
         if response_data['success']: