# 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 %}
Rarity
MSB Fee
Common ⭐⭐
400
Common ⭐⭐⭐
400
Uncommon ⭐⭐
500
Uncommon ⭐⭐⭐
500
Rare ⭐⭐
600
Rare ⭐⭐⭐
600
Epic ⭐⭐
700
Epic ⭐⭐⭐
700
Legendary ⭐⭐
800
Legendary ⭐⭐⭐
800
upgrade reference example
---
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