diff --git a/src/claude_agent_sdk/_internal/transport/subprocess_cli.py b/src/claude_agent_sdk/_internal/transport/subprocess_cli.py
index 1f0aac58..c1b4a694 100644
--- a/src/claude_agent_sdk/_internal/transport/subprocess_cli.py
+++ b/src/claude_agent_sdk/_internal/transport/subprocess_cli.py
@@ -373,6 +373,7 @@ async def connect(self) -> None:
                 stderr=stderr_dest,
                 cwd=self._cwd,
                 env=process_env,
+                start_new_session=True,
                 user=self._options.user,
             )