[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [spendHashes](./bitburner.hacknet.spendhashes.md) ## Hacknet.spendHashes() method Purchase a hash upgrade. **Signature:** ```typescript spendHashes(upgName: HacknetServerHashUpgrade, upgTarget?: string, count?: number): boolean; ``` ## Parameters

Parameter	Type	Description
upgName	[HacknetServerHashUpgrade](./bitburner.hacknetserverhashupgrade.md)	Name of the upgrade using hash of Hacknet Server.
upgTarget	string	_(Optional)_ Object to which upgrade applies. Required for certain upgrades.
count	number	_(Optional)_ Number of upgrades to buy at once. Must be a non-negative integer. Defaults to 1 if not specified. For compatibility reasons, upgTarget must be specified, even if it is not used, in order to specify count.

**Returns:** boolean True if the upgrade is successfully purchased, and false otherwise. ## Remarks RAM cost: 0.5 GB This function is only applicable for Hacknet Servers (the upgraded version of a Hacknet Node). Spend the hashes generated by your Hacknet Servers on an upgrade. Returns a boolean value - true if the upgrade is successfully purchased, and false otherwise. The name of the upgrade must be an exact match. The `upgTarget` argument is used for upgrades such as `Reduce Minimum Security`, which applies to a specific server. In this case, the `upgTarget` argument must be the hostname or IP of the server. ## Example ```js // For upgrades where no target is required ns.hacknet.spendHashes("Sell for Corporation Funds"); // For upgrades requiring a target ns.hacknet.spendHashes("Increase Maximum Money", "foodnstuff"); ```