[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [upgradeCore](./bitburner.hacknet.upgradecore.md) ## Hacknet.upgradeCore() method Upgrade the core of a hacknet node. Signature: ```typescript upgradeCore(index: number, n: number): boolean; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | index | number | Index/Identifier of Hacknet Node. | | n | number | Number of cores to purchase. Must be positive. Rounded to nearest integer. | Returns: boolean True if the Hacknet Node’s cores are successfully purchased, false otherwise. ## Remarks RAM cost: 0 GB Tries to purchase n cores for the specified Hacknet Node. Returns true if it successfully purchases n cores for the Hacknet Node or if it purchases some positive amount and the Node reaches its max number of cores. Returns false otherwise.