diff --git a/pyproject.toml b/pyproject.toml
index f5cf38c..6f9983f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -72,4 +72,13 @@ exclude = ["migrations", "tests"]
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
+# The integration test suite shares one session-scoped asyncpg engine
+# (tests/conftest.py:engine) across every test, for speed — schema is
+# created once instead of per test. asyncpg connections are bound to the
+# event loop they were created in, so every fixture/test must run on that
+# same loop; pytest-asyncio's default is a fresh loop per test, which
+# breaks that assumption ("another operation is in progress" / "attached
+# to a different loop"). Pinning both to "session" fixes it.
+asyncio_default_fixture_loop_scope = "session"
+asyncio_default_test_loop_scope = "session"
 testpaths = ["tests"]