diff --git a/mlpp_lib/model_selection.py b/mlpp_lib/model_selection.py
index 06d1c56..b9a279a 100644
--- a/mlpp_lib/model_selection.py
+++ b/mlpp_lib/model_selection.py
@@ -102,7 +102,6 @@ def __init__(
         seed: Optional[int] = 10,
         time_dim_name: str = "forecast_reference_time",
     ):
-
         if not time_split.keys() == station_split.keys():
             raise ValueError(
                 "Time split and station split must be defined "
@@ -362,7 +361,7 @@ def random_split(
     seed: int = 10,
 ) -> dict[str, np.ndarray]:
     """Split an input index array randomly"""
-    np.random.seed(seed)
+    rng = np.random.default_rng(np.random.PCG64(seed))
 
     assert np.isclose(sum(split_fractions.values()), 1.0)
 
@@ -370,7 +369,7 @@ def random_split(
     partitions = list(split_fractions.keys())
     fractions = np.array(list(split_fractions.values()))
 
-    shuffled_index = np.random.permutation(index)
+    shuffled_index = rng.permutation(index)
     indices = np.floor(np.cumsum(fractions)[:-1] * n_samples).astype(int)
     sub_arrays = np.split(shuffled_index, indices)
     return dict(zip(partitions, sub_arrays))