diff --git a/pyproject.toml b/pyproject.toml
index af1790d..42a338d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,7 @@ Documentation = "https://truststore.readthedocs.io"
 
 [tool.pytest.ini_options]
 asyncio_mode = "strict"
+asyncio_default_fixture_loop_scope = "function"
 filterwarnings = [
   "error",
   # See: aio-libs/aiohttp#7545