diff --git a/models/card_group.py b/models/card_group.py
index e11f51e..4feb19d 100644
--- a/models/card_group.py
+++ b/models/card_group.py
@@ -27,7 +27,7 @@ class CardGroup(BaseModel):
     )
     bill_requests: Mapped[list['GroupBillRequest']] = relationship(
         back_populates='group',
-        lazy='joined',
+        lazy='selectin',
         uselist=True,
     )