If you had "October 26 Ethereum upgrade" marked on your calendar, the schedule has changed.

The Ethereum Foundation postponed the application of Glamsterdam to the Holesky testnet on the 22nd. The original schedule was the 26th UTC, which would have been early morning on the 27th KST. The official announcement checked on the 26th does not have a new date yet. It also isn't an announcement that fixed the mainnet deployment date.

The reason for the delay is to further examine a proposal called EIP-8037. This proposal changes the gas cost and calculation method when adding new data to the blockchain, and they are conducting additional research on how it affects existing smart contracts. They are checking not only how the new rules work but also how existing code behaves under them.

So, what should you do if you normally use Ethereum apps or hold ETH? The Foundation stated that there is nothing for mainnet users or ETH holders to do as a result of this announcement. You don't need to change anything in your wallet just because the date has moved.

However, if you operate Hoodi nodes or validators, there are things to check. You should ensure that the old deployment schedule has been removed from the latest updates for both execution and consensus clients. Don't just rely on the version table from previous announcements; please check each client's specific guidance regarding the postponement.