diff --git a/models.py b/models.py
index ba900b4..a1cd566 100644
--- a/models.py
+++ b/models.py
@@ -29,7 +29,7 @@ class User(SQLModel, table=True):
     username: str = Field(index=True)
     password: str
     role: int
-    tenant_id: int = Field(default=None, foreign_key="Tenant.id")
+    tenant_id: int|None = Field(default=None, foreign_key="Tenant.id")
     tenant: Tenant = Relationship(back_populates="users")
     projects: List["Project"] = Relationship(back_populates="users", link_model=ProjectUserLink)