# Upgrade
The upgrade functionality consists of the possibility of burning [usdmsb](https://docs.mining-squad.app/en/readme/tokenomics/token/usdmsb "mention") and another NFT character of the same rarity to improve your selected miner. Each [raritys](https://docs.mining-squad.app/en/readme/recursos/miners/raritys "mention") has an upgrade cost, but the improvement is the same for everyone. Each upgrade adds **+1** [lancheira](https://docs.mining-squad.app/en/readme/recursos/miners/lancheira "mention") **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 %}
