[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	_(Optional)_ Number of cores to purchase. Must be positive. Will be rounded to the nearest integer. Defaults to 1 if not specified.

**Returns:** boolean True if the Hacknet Node’s cores are successfully purchased, false otherwise. ## Remarks RAM cost: 0.5 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.