diff --git a/src/unstructured_client/_hooks/custom/form_utils.py b/src/unstructured_client/_hooks/custom/form_utils.py
index b04f5d8b..6a4b6bab 100644
--- a/src/unstructured_client/_hooks/custom/form_utils.py
+++ b/src/unstructured_client/_hooks/custom/form_utils.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import logging
-from typing import Union
+from typing import Dict, List, Union
 
 from requests_toolbelt.multipart.decoder import MultipartDecoder
 
@@ -9,7 +9,7 @@
 from unstructured_client.models import shared
 
 logger = logging.getLogger(UNSTRUCTURED_CLIENT_LOGGER_NAME)
-FormData = dict[str, Union[str, shared.Files, list[str]]]
+FormData = Dict[str, Union[str, shared.Files, List[str]]]
 
 PARTITION_FORM_FILES_KEY = "files"
 PARTITION_FORM_SPLIT_PDF_PAGE_KEY = "split_pdf_page"