diff --git a/starrail_damage_cal/excel/model.py b/starrail_damage_cal/excel/model.py
index 26ca1e4..83d90d9 100644
--- a/starrail_damage_cal/excel/model.py
+++ b/starrail_damage_cal/excel/model.py
@@ -46,7 +46,7 @@ class SingleEquipmentPromotion(Struct):
     BaseAttackAdd: PromotionAttr
     BaseDefence: PromotionAttr
     BaseDefenceAdd: PromotionAttr
-    Promotion: Union[int, None] = None
+    Promotion: int = 0
     PlayerLevelRequire: Union[int, None] = None