diff --git a/python/cudf/cudf/testing/_utils.py b/python/cudf/cudf/testing/_utils.py
index fb4a7c05604b..4ea03abe7152 100644
--- a/python/cudf/cudf/testing/_utils.py
+++ b/python/cudf/cudf/testing/_utils.py
@@ -72,10 +72,10 @@
 ]
 
 
-def set_random_null_mask_inplace(series, null_probability=0.5, seed=None):
+def set_random_null_mask_inplace(series, null_probability=0.5):
     """Randomly nullify elements in series with the provided probability."""
     probs = [null_probability, 1 - null_probability]
-    rng = np.random.default_rng(seed=seed)
+    rng = np.random.default_rng(seed=0)
     mask = rng.choice([False, True], size=len(series), p=probs)
     series.iloc[mask] = None
 
diff --git a/python/cudf/cudf/tests/test_doctests.py b/python/cudf/cudf/tests/test_doctests.py
index daaec5bf7a0b..0f0bf449d21f 100644
--- a/python/cudf/cudf/tests/test_doctests.py
+++ b/python/cudf/cudf/tests/test_doctests.py
@@ -97,9 +97,6 @@ def _find_doctests_in_obj(obj, finder=None, criteria=None):
     "register_series_accessor": pytest.mark.filterwarnings(
         "ignore:Attribute .* will be overridden:UserWarning"
     ),
-    "StringMethods.edit_distance_matrix": pytest.mark.filterwarnings(
-        "ignore:edit_distance_matrix:FutureWarning"
-    ),
 }
 
 
diff --git a/python/cudf_polars/tests/conftest.py b/python/cudf_polars/tests/conftest.py
index 55f9097c097b..44c31ef4ef7b 100644
--- a/python/cudf_polars/tests/conftest.py
+++ b/python/cudf_polars/tests/conftest.py
@@ -404,6 +404,7 @@ def pytest_collection_modifyitems(
 
 
 @pytest.fixture(scope="module")
-def parquet_stats_executor() -> concurrent.futures.ThreadPoolExecutor:
+def parquet_stats_executor() -> concurrent.futures.ThreadPoolExecutor:  # type: ignore[misc]
     """A thread pool to use for cudf-polars status collection."""
-    return concurrent.futures.ThreadPoolExecutor()
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        yield executor