diff --git a/tests/conftest.py b/tests/conftest.py
index a1b7bf2f..cf29b754 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -8,6 +8,7 @@ from nonebug import NONEBOT_INIT_KWARGS
 from nonebug.app import App
 from nonebug.mixin.process import MatcherContext
 import pytest
+from pytest_asyncio import is_async_test
 from pytest_mock import MockerFixture
 from respx import MockRouter
 
@@ -22,6 +23,13 @@ def get_response_json(path: str) -> dict:
     )
 
 
+def pytest_collection_modifyitems(items: list[pytest.Item]):
+    pytest_asyncio_tests = (item for item in items if is_async_test(item))
+    session_scope_marker = pytest.mark.asyncio(loop_scope="session")
+    for async_test in pytest_asyncio_tests:
+        async_test.add_marker(session_scope_marker, append=False)
+
+
 def pytest_configure(config: pytest.Config) -> None:
     config.stash[NONEBOT_INIT_KWARGS] = {
         "driver": "~fastapi+~httpx+~websockets",