Can upgrade smart contract for Merkle Tree Airdrop

Smart Contracts
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1

Hi,

We are planning to develop a ERC20 token airdrop event using Merkle Tree. However, it's possible that the whitelist (wallet address + amount of tokens) will be updated during the event.

Can I use upgradable smart contract in this case? And if we can, does it mean that we only need to update the value of the top hash.

Thanks.

2

You can update the merkle tree root even without an upgradable contract. You only need the the setter function

3

Thanks @FreezyEx. Would you please show me how the smart contract can be written with setter function to update the merkle root? A working smart contract example is preferred.