diff --git a/src/claude_code_sdk/_internal/transport/subprocess_cli.py b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
index c6da949..ab7de7e 100644
--- a/src/claude_code_sdk/_internal/transport/subprocess_cli.py
+++ b/src/claude_code_sdk/_internal/transport/subprocess_cli.py
@@ -171,7 +171,7 @@ class SubprocessCLITransport(Transport):
             raise CLIConnectionError("Not connected")
 
         json_buffer = ""
-        
+
         # Process stdout messages first
         try:
             async for line in self._stdout_stream:
diff --git a/tests/test_fastapi_streaming_compatibility.py b/tests/test_fastapi_streaming_compatibility.py
index 47a678c..20a6ad5 100644
--- a/tests/test_fastapi_streaming_compatibility.py
+++ b/tests/test_fastapi_streaming_compatibility.py
@@ -9,7 +9,7 @@ def test_no_task_groups_in_receive_messages():
     """Verify receive_messages doesn't use task groups (fixes FastAPI issue #4)."""
     # Get the source code of receive_messages
     source = inspect.getsource(SubprocessCLITransport.receive_messages)
-    
+
     # The fix: ensure no task group or task creation
     assert "create_task_group" not in source, (
         "receive_messages must not use create_task_group to avoid "
@@ -19,7 +19,7 @@ def test_no_task_groups_in_receive_messages():
         "receive_messages must not create tasks to maintain "
         "compatibility with FastAPI's generator handling"
     )
-    
+
     # Verify stderr is still being read (sequential approach)
     assert "_stderr_stream" in source, "Should still read stderr"
-    assert "stderr_lines" in source, "Should collect stderr output"
\ No newline at end of file
+    assert "stderr_lines" in source, "Should collect stderr output"