diff --git a/third_party/2and3/requests/sessions.pyi b/third_party/2and3/requests/sessions.pyi
index 6429db7c1..74af89846 100644
--- a/third_party/2and3/requests/sessions.pyi
+++ b/third_party/2and3/requests/sessions.pyi
@@ -96,7 +96,7 @@ class Session(SessionRedirectMixin):
     def put(self, url: Union[Text, bytes], data: _Data = ..., **kwargs) -> Response: ...
     def patch(self, url: Union[Text, bytes], data: _Data = ..., **kwargs) -> Response: ...
     def delete(self, url: Union[Text, bytes], **kwargs) -> Response: ...
-    def send(self, request, **kwargs): ...
+    def send(self, request: PreparedRequest, **kwargs) -> Response: ...
     def merge_environment_settings(self, url, proxies, stream, verify, cert): ...
     def get_adapter(self, url): ...
     def close(self) -> None: ...