diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 7cfbb2b..b34433b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -6,7 +6,7 @@ repos:
       - id: trailing-whitespace
       - id: no-commit-to-branch
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.13.1
+    rev: v0.13.2
     hooks:
       - id: ruff-check
         args: [--fix, --exit-non-zero-on-fix]
diff --git a/src/fast_array_utils/stats/_is_constant.py b/src/fast_array_utils/stats/_is_constant.py
index ed64151..4df5efd 100644
--- a/src/fast_array_utils/stats/_is_constant.py
+++ b/src/fast_array_utils/stats/_is_constant.py
@@ -56,7 +56,7 @@ def _is_constant_cs(a: types.CSBase, /, *, axis: Literal[0, 1] | None = None) ->
     n_row, n_col = a.shape
     if axis is None:
         if len(a.data) == n_row * n_col:
-            return is_constant(cast("NDArray[Any]", a.data))
+            return is_constant(a.data)
         return bool((a.data == 0).all())
     shape = (n_row, n_col) if axis == 1 else (n_col, n_row)
     match axis, a.format:
diff --git a/tests/test_stats.py b/tests/test_stats.py
index c459475..a33b1d3 100644
--- a/tests/test_stats.py
+++ b/tests/test_stats.py
@@ -191,7 +191,7 @@ def test_mean(array_type: ArrayType[Array], axis: Literal[0, 1] | None, np_arr:
     if isinstance(result, types.CupyArray | types.CupyCSMatrix):
         result = result.get()
 
-    expected = np.mean(np_arr, axis=axis)  # type: ignore[arg-type]
+    expected = np.mean(np_arr, axis=axis)
     np.testing.assert_array_equal(result, expected)
 
 
@@ -209,8 +209,8 @@ def test_mean_var(
     if isinstance(mean, types.CupyArray) and isinstance(var, types.CupyArray):
         mean, var = mean.get(), var.get()
 
-    mean_expected = np.mean(np_arr, axis=axis)  # type: ignore[arg-type]
-    var_expected = np.var(np_arr, axis=axis, ddof=1)  # type: ignore[arg-type]
+    mean_expected = np.mean(np_arr, axis=axis)
+    var_expected = np.var(np_arr, axis=axis, ddof=1)
     np.testing.assert_array_equal(mean, mean_expected)
     np.testing.assert_array_almost_equal(var, var_expected)  # type: ignore[arg-type]