diff --git a/fastapi_gateway/core.py b/fastapi_gateway/core.py
index bff194d..929b681 100644
--- a/fastapi_gateway/core.py
+++ b/fastapi_gateway/core.py
@@ -1,9 +1,8 @@
 import functools
 from aiohttp import ContentTypeError, ClientConnectorError
 from fastapi import Request, Response, HTTPException, status, params
-from typing import List, Optional, Sequence, Dict, Union, Any, Type
+from typing import List, Optional, Sequence, Set, Dict, Union, Any, Type
 from fastapi.datastructures import Default
-from fastapi.encoders import SetIntStr, DictIntStrAny
 from starlette.responses import JSONResponse
 from starlette.routing import BaseRoute
 
@@ -17,6 +16,9 @@
     generate_headers_for_microservice,
 )
 
+SetIntStr = Set[Union[int, str]]
+DictIntStrAny = Dict[Union[int, str], Any]
+
 
 def route(
     request_method,