[Home](./index.md) > [bitburner](./bitburner.md) > [WarehouseAPI](./bitburner.warehouseapi.md) > [upgradeWarehouse](./bitburner.warehouseapi.upgradewarehouse.md) ## WarehouseAPI.upgradeWarehouse() method Upgrade warehouse. **Signature:** ```typescript upgradeWarehouse(divisionName: string, city: CityName, amt?: number): void; ``` ## Parameters

Parameter	Type	Description
divisionName	string	Name of the division
city	[CityName](./bitburner.cityname.md)	Name of the city
amt	number	_(Optional)_ Amount of upgrades. Defaults to 1.

**Returns:** void ## Remarks RAM cost: 20 GB