diff --git a/stubs/requests/requests/adapters.pyi b/stubs/requests/requests/adapters.pyi
index 3547f2b41..b7309e05d 100644
--- a/stubs/requests/requests/adapters.pyi
+++ b/stubs/requests/requests/adapters.pyi
@@ -53,7 +53,11 @@ class HTTPAdapter(BaseAdapter):
     config: Any
     proxy_manager: Any
     def __init__(
-        self, pool_connections: int = ..., pool_maxsize: int = ..., max_retries: Union[Retry, int] = ..., pool_block: bool = ...
+        self,
+        pool_connections: int = ...,
+        pool_maxsize: int = ...,
+        max_retries: Union[Retry, int, None] = ...,
+        pool_block: bool = ...,
     ) -> None: ...
     poolmanager: Any
     def init_poolmanager(self, connections, maxsize, block=..., **pool_kwargs): ...