diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6bef0c8..9d4d616 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -15,7 +15,14 @@ repos:
     rev: v2.3.0
     hooks:
       - id: setup-cfg-fmt
-        args: [--include-version-classifiers, --max-py-version, "3.11"]
+        args:
+          [
+            --include-version-classifiers,
+            --min-py-version,
+            "3.8",
+            --max-py-version,
+            "3.11",
+          ]
 
   - repo: https://github.com/asottile/pyupgrade
     rev: v3.7.0
diff --git a/tests/utils.py b/tests/utils.py
index 8a9906a..26bb3ec 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -23,10 +23,12 @@
     Any,
     Callable,
     Dict,
+    Optional,
     Protocol,
     Size,
     Tensor,
     TensorOrTensors,
+    Union,
 )
 
 from .conftest import FAST_MODE
@@ -112,7 +114,7 @@ class _GradcheckFunction(Protocol):
     Type annotation for gradcheck function.
     """
 
-    def __call__(
+    def __call__(  # type: ignore
         self,
         func: Callable[..., TensorOrTensors],
         inputs: TensorOrTensors,
@@ -139,11 +141,11 @@ class _GradgradcheckFunction(Protocol):
     Type annotation for gradgradcheck function.
     """
 
-    def __call__(
+    def __call__(  # type: ignore
         self,
         func: Callable[..., TensorOrTensors],
         inputs: TensorOrTensors,
-        grad_outputs: TensorOrTensors | None = None,
+        grad_outputs: Optional[TensorOrTensors] = None,
         *,
         eps: float = 1e-6,
         atol: float = 1e-5,
@@ -162,7 +164,7 @@ def __call__(
 
 
 def _wrap_gradcheck(
-    gradcheck_func: _GradcheckFunction | _GradgradcheckFunction,
+    gradcheck_func: Union[_GradcheckFunction, _GradgradcheckFunction],
     func: Callable[..., TensorOrTensors],
     diffvars: TensorOrTensors,
     **kwargs: Any,
diff --git a/tox.ini b/tox.ini
index a62d990..f01a4cd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,6 +23,6 @@ deps =
     pytest-random-order
 commands =
     coverage erase
-    coverage run -m pytest -svv {posargs:--random-order-bucket=global tests}
+    coverage run -m pytest -vv {posargs:--random-order-bucket=global tests}
     coverage report -m
     coverage xml -o coverage.xml