diff --git a/litellm/llms/fine_tuning_apis/vertex_ai.py b/litellm/llms/fine_tuning_apis/vertex_ai.py
index 0fd882c815e..4c5938e68e9 100644
--- a/litellm/llms/fine_tuning_apis/vertex_ai.py
+++ b/litellm/llms/fine_tuning_apis/vertex_ai.py
@@ -88,19 +88,28 @@ class VertexFineTuningAPI(VertexLLM):
 
     def convert_openai_request_to_vertex(
         self, create_fine_tuning_job_data: FineTuningJobCreate, **kwargs
-    ) -> dict:
+    ) -> FineTuningJobCreate:
         """
         convert request from OpenAI format to Vertex format
         https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/tuning
         supervised_tuning_spec = FineTunesupervisedTuningSpec(
         """
+        hyperparameters = create_fine_tuning_job_data.hyperparameters
         supervised_tuning_spec = FineTunesupervisedTuningSpec(
             training_dataset_uri=create_fine_tuning_job_data.training_file,
             validation_dataset=create_fine_tuning_job_data.validation_file,
-            epoch_count=create_fine_tuning_job_data.hyperparameters.n_epochs,
-            learning_rate_multiplier=create_fine_tuning_job_data.hyperparameters.learning_rate_multiplier,
-            adapter_size=kwargs.get("AdapterSize"),
         )
+
+        if hyperparameters:
+            if hyperparameters.n_epochs:
+                supervised_tuning_spec["epoch_count"] = int(hyperparameters.n_epochs)
+            if hyperparameters.learning_rate_multiplier:
+                supervised_tuning_spec["learning_rate_multiplier"] = float(
+                    hyperparameters.learning_rate_multiplier
+                )
+
+        supervised_tuning_spec["adapter_size"] = kwargs.get("adapter_size")
+
         fine_tune_job = FineTuneJobCreate(
             baseModel=create_fine_tuning_job_data.model,
             supervisedTuningSpec=supervised_tuning_spec,
@@ -113,7 +122,7 @@ class VertexFineTuningAPI(VertexLLM):
         self,
         fine_tuning_url: str,
         headers: dict,
-        request_data: FineTuneJobCreate,
+        request_data: FineTuningJobCreate,
     ):
         from litellm.fine_tuning.main import FineTuningJob
 
diff --git a/litellm/tests/test_fine_tuning_api.py b/litellm/tests/test_fine_tuning_api.py
index 6adb5e36906..4eebcd2f7fd 100644
--- a/litellm/tests/test_fine_tuning_api.py
+++ b/litellm/tests/test_fine_tuning_api.py
@@ -256,7 +256,7 @@ def test_convert_openai_request_to_vertex_with_adapter_size():
     )
 
     result = vertex_finetune_api.convert_openai_request_to_vertex(
-        openai_data, AdapterSize="SMALL"
+        openai_data, adapter_size="SMALL"
     )
 
     print("converted vertex ai result=", result)