According to the Ethereum Classic team, Mystique hardfork is going to take place at height #14525000, estimated on 2022-02-13 at 19:32 UTC. Gate.io supports this upgrade for users. If your ETC tokens are on Gate.io, you dont have to do anything in particular.

　　Gate.io will suspend ETC deposits and withdrawals during the upgrade. ETC trading will not be affected. Deposits and withdrawals will be resumed as soon as possible after this upgrade.

　　The Mystique hardfork introducesEIP-3529 and EIP 3541 to Ethereum Classic, which were introduced on the Ethereum (ETH) network via the London hardfork on 2021 Aug 05.

　　Deposit ETC at https://www.gate.io/myaccount/deposit/ETC

　　ETC/USDT Market: https://www.gate.io/trade/ETC_USDT

　　Learn more:

　　https://forking.etccore.in

　　https://github.com/etclabscore/core-geth/releases/tag/v1.12.4

　　https://medium.com/etccooperative/mystique-hard-fork-is-coming-february-13th-2022-54dbea76089f