> For the complete documentation index, see [llms.txt](https://docs.mining-squad.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mining-squad.app/en/readme/recursos/miners/upgrade.md).
# Upgrade
The upgrade functionality consists of the possibility of burning [$MSB](/en/readme/tokenomics/token/usdmsb.md) and another NFT character of the same rarity to improve your selected miner. Each [Rarity](/en/readme/recursos/miners/raritys.md) has an upgrade cost, but the improvement is the same for everyone. Each upgrade adds **+1** [Lunchboxes](/en/readme/recursos/miners/lancheira.md) **per day**, limited to 2 upgrades per miner reaching the **maximum lvl of 3 stars**. When upgrading, the miner who will level up also receives a fixed increase in hit power equivalent to **30% of the miner's base HP burned** for the upgrade.
{% hint style="info" %}
**Dummy and Unique miners cannot upgrade!**
{% endhint %}