diff --git a/core/nurse_scheduling/loader.py b/core/nurse_scheduling/loader.py
index 14713c41..e137523c 100644
--- a/core/nurse_scheduling/loader.py
+++ b/core/nurse_scheduling/loader.py
@@ -51,4 +51,4 @@ def load_data(content: bytes) -> NurseSchedulingData:
         NurseSchedulingData: The validated scheduling data
     """
     data = _load_yaml(content)
-    return NurseSchedulingData(**data)
+    return NurseSchedulingData.model_validate(data)