diff --git a/litellm/llms/vertex_httpx.py b/litellm/llms/vertex_httpx.py
index 4fb554fe499..9fc9080b086 100644
--- a/litellm/llms/vertex_httpx.py
+++ b/litellm/llms/vertex_httpx.py
@@ -3,7 +3,7 @@ import json
 from enum import Enum
 import requests  # type: ignore
 import time
-from typing import Callable, Optional, Union, List, Any
+from typing import Callable, Optional, Union, List, Any, Tuple
 from litellm.utils import ModelResponse, Usage, CustomStreamWrapper, map_finish_reason
 import litellm, uuid
 import httpx, inspect  # type: ignore
@@ -34,7 +34,7 @@ class VertexLLM(BaseLLM):
         self._credentials: Optional[Credentials] = None
         self.project_id: Optional[str] = None
 
-    def load_auth(self) -> tuple[Any, str]:
+    def load_auth(self) -> Tuple[Any, str]:
         from google.auth.transport.requests import Request  # type: ignore[import-untyped]
         from google.auth.credentials import Credentials  # type: ignore[import-untyped]
         import google.auth as google_auth