[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [upgradeCache](./bitburner.hacknet.upgradecache.md) ## Hacknet.upgradeCache() method Upgrade the cache of a hacknet node. **Signature:** ```typescript upgradeCache(index: number, n?: number): boolean; ``` ## Parameters

Parameter	Type	Description
index	number	Index/Identifier of Hacknet Node.
n	number	_(Optional)_ Number of cache levels 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 cache level is successfully upgraded, false otherwise. ## Remarks RAM cost: 0.5 GB This function is only applicable for Hacknet Servers (the upgraded version of a Hacknet Node). Tries to upgrade the specified Hacknet Server’s cache n times. Returns true if it successfully upgrades the Server’s cache n times, or if it purchases some positive amount and the Server reaches its max cache level. Returns false otherwise.