diff --git a/metagpt/__init__.py b/metagpt/__init__.py
index b9c530d24..71ddd1aff 100644
--- a/metagpt/__init__.py
+++ b/metagpt/__init__.py
@@ -1,5 +1,7 @@
-#!/usr/bin/env python 
+#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # @Time    : 2023/4/24 22:26
 # @Author  : alexanderwu
 # @File    : __init__.py
+
+from metagpt import _compat as _  # noqa: F401
diff --git a/metagpt/_compat.py b/metagpt/_compat.py
new file mode 100644
index 000000000..e94a4d095
--- /dev/null
+++ b/metagpt/_compat.py
@@ -0,0 +1,15 @@
+import platform
+import sys
+import warnings
+
+if sys.implementation.name == "cpython" and platform.system() == "Windows" and sys.version_info[:2] == (3, 9):
+    # https://github.com/python/cpython/pull/92842
+
+    from asyncio.proactor_events import _ProactorBasePipeTransport
+
+    def pacth_del(self, _warn=warnings.warn):
+        if self._sock is not None:
+            _warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
+            self._sock.close()
+
+    _ProactorBasePipeTransport.__del__ = pacth_del
diff --git a/startup.py b/startup.py
index e6d5fc4e9..e2a903c9b 100644
--- a/startup.py
+++ b/startup.py
@@ -1,11 +1,16 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 import asyncio
-import platform
+
 import fire
 
-from metagpt.roles import Architect, Engineer, ProductManager
-from metagpt.roles import ProjectManager, QaEngineer
+from metagpt.roles import (
+    Architect,
+    Engineer,
+    ProductManager,
+    ProjectManager,
+    QaEngineer,
+)
 from metagpt.software_company import SoftwareCompany
 
 
@@ -15,15 +20,17 @@ async def startup(
     n_round: int = 5,
     code_review: bool = False,
     run_tests: bool = False,
-    implement: bool = True
+    implement: bool = True,
 ):
     """Run a startup. Be a boss."""
     company = SoftwareCompany()
-    company.hire([
-        ProductManager(),
-        Architect(),
-        ProjectManager(),
-    ])
+    company.hire(
+        [
+            ProductManager(),
+            Architect(),
+            ProjectManager(),
+        ]
+    )
 
     # if implement or code_review
     if implement or code_review:
@@ -46,7 +53,7 @@ def main(
     n_round: int = 5,
     code_review: bool = True,
     run_tests: bool = False,
-    implement: bool = True
+    implement: bool = True,
 ):
     """
     We are a software startup comprised of AI. By investing in us,
@@ -58,12 +65,8 @@ def main(
     :param code_review: Whether to use code review.
     :return:
     """
-    if platform.system() == "Windows":
-        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
-    asyncio.run(startup(idea, investment, n_round,
-                code_review, run_tests, implement))
+    asyncio.run(startup(idea, investment, n_round, code_review, run_tests, implement))
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     fire.Fire(main)
-