diff --git a/tests/plugins/test_mlflow_extension.py b/tests/plugins/test_mlflow_extension.py
index d98d3ed47..d365809e1 100644
--- a/tests/plugins/test_mlflow_extension.py
+++ b/tests/plugins/test_mlflow_extension.py
@@ -17,9 +17,12 @@
 
 from pathlib import Path
 
-import mlflow
 import numpy as np
 import pytest
+
+# Skip entire module if mlflow is not available (e.g., Python 3.14+)
+mlflow = pytest.importorskip("mlflow")
+
 from sklearn.base import BaseEstimator
 from sklearn.linear_model import LinearRegression
 
diff --git a/tests/test_base.py b/tests/test_base.py
index 663892d4c..109d0507c 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -481,17 +481,19 @@ def test_StrictIndexTypePandasDataFrameResult_build_result(outputs, expected_res
                 ),
                 "series2": pd.Series(
                     [4, 5, 6],
-                    index=pd.PeriodIndex(year=[2022, 2022, 2022], month=[1, 2, 3], freq="M"),
+                    index=pd.PeriodIndex.from_fields(
+                        year=[2022, 2022, 2022], month=[1, 2, 3], freq="M"
+                    ),
                 ),
                 "series3": pd.Series(
                     [4, 5, 6],
-                    index=pd.PeriodIndex(
+                    index=pd.PeriodIndex.from_fields(
                         year=[2022, 2022, 2022], month=[1, 1, 1], day=[3, 4, 5], freq="B"
                     ),
                 ),
                 "series4": pd.Series(
                     [4, 5, 6],
-                    index=pd.PeriodIndex(
+                    index=pd.PeriodIndex.from_fields(
                         year=[2022, 2022, 2022], month=[1, 1, 1], day=[4, 11, 18], freq="W"
                     ),
                 ),