[Home](./index.md) > [bitburner](./bitburner.md) > [Bladeburner](./bitburner.bladeburner.md) > [upgradeSkill](./bitburner.bladeburner.upgradeskill.md) ## Bladeburner.upgradeSkill() method Upgrade skill. **Signature:** ```typescript upgradeSkill(skillName: BladeburnerSkillName, count?: number): boolean; ``` ## Parameters

Parameter	Type	Description
skillName	[BladeburnerSkillName](./bitburner.bladeburnerskillname.md)	Name of skill to be upgraded. Case-sensitive and must be an exact match.
count	number	_(Optional)_ Number of times to upgrade the skill. Defaults to 1 if not specified.

**Returns:** boolean true if the skill is successfully upgraded, and false otherwise. ## Remarks RAM cost: 4 GB Attempts to upgrade the specified Bladeburner skill the specified number of times. Returns true if the skill is successfully upgraded, and false otherwise.