diff --git a/litellm/litellm_core_utils/realtime_streaming.py b/litellm/litellm_core_utils/realtime_streaming.py
index 898acadda60..8df41aea4a3 100644
--- a/litellm/litellm_core_utils/realtime_streaming.py
+++ b/litellm/litellm_core_utils/realtime_streaming.py
@@ -159,7 +159,7 @@ class RealTimeStreaming:
                 event_type
                 == "conversation.item.input_audio_transcription.completed"
             ):
-                transcript = event_obj.get("transcript", "")
+                transcript = cast(str, event_obj.get("transcript", ""))
                 if transcript:
                     self.input_messages.append(
                         {"role": "user", "content": transcript}
@@ -174,7 +174,7 @@ class RealTimeStreaming:
         try:
             if event_obj.get("type") != "response.done":
                 return
-            response = event_obj.get("response", {})
+            response = cast(Dict[str, Any], event_obj.get("response", {}))
             for item in response.get("output", []):
                 if item.get("type") == "function_call":
                     self.tool_calls.append(
diff --git a/tests/test_litellm/proxy/pass_through_endpoints/test_llm_pass_through_endpoints.py b/tests/test_litellm/proxy/pass_through_endpoints/test_llm_pass_through_endpoints.py
index cac8f98cbb7..fdc821ef8bb 100644
--- a/tests/test_litellm/proxy/pass_through_endpoints/test_llm_pass_through_endpoints.py
+++ b/tests/test_litellm/proxy/pass_through_endpoints/test_llm_pass_through_endpoints.py
@@ -224,6 +224,7 @@ class TestVertexAIPassThroughHandler:
 
         # Mock request
         mock_request = Mock()
+        mock_request.state = None  # Prevent Mock from returning a truthy _cached_headers
         mock_request.method = "POST"
         mock_request.headers = {
             "Authorization": "Bearer test-creds",
@@ -323,6 +324,7 @@ class TestVertexAIPassThroughHandler:
 
         # Mock request
         mock_request = Mock()
+        mock_request.state = None  # Prevent Mock from returning a truthy _cached_headers
         mock_request.method = "POST"
         mock_request.headers = {
             "Authorization": "Bearer test-creds",
@@ -905,6 +907,7 @@ class TestVertexAIDiscoveryPassThroughHandler:
 
         # Mock request
         mock_request = Mock()
+        mock_request.state = None  # Prevent Mock from returning a truthy _cached_headers
         mock_request.method = "POST"
         mock_request.headers = {
             "Authorization": "Bearer test-key",