diff --git a/src/mcp/client/sse.py b/src/mcp/client/sse.py
index 4f6241a72..761f43997 100644
--- a/src/mcp/client/sse.py
+++ b/src/mcp/client/sse.py
@@ -120,6 +120,7 @@ async def post_writer(endpoint_url: str):
                                             mode="json",
                                             exclude_none=True,
                                         ),
+                                        timeout=timeout,
                                     )
                                     response.raise_for_status()
                                     logger.debug(