diff --git a/pyproject.toml b/pyproject.toml
index 58f0aa2e..6e901920 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,7 +63,7 @@ known_first_party = ["app"]
 [tool.mypy]
 python_version = "3.11"
 plugins = ["pydantic.mypy", "sqlalchemy.ext.mypy.plugin"]
-exclude = ['syncmaster/tests',]
+exclude = 'syncmaster/tests'
 
 [[tool.mypy.overrides]]
 module = "alembic.*"