Ethereum Sets October 6 for Sepolia Upgrade – What Will Change?

October 6 activation

Network: Sepolia testnet

Time: 13:53:36 UTC, October 6, 2026

Mainnet and Hoodi: Dates remain undecided in the official deployment schedule.

The Ethereum Foundation’s announcement gives Sepolia operators a deadline to update their software and application teams a network on which to test the changes. Ordinary ETH holders have no upgrade action to take for this activation.

Glamsterdam prepares Ethereum to handle more work while changing the charges for some operations. The public test will let developers check whether applications still execute correctly and estimate fees accurately under those rules.

Will Glamsterdam change what users pay?

The effect depends on the transaction. Creating an account, deploying contract code or adding storage leaves information that Ethereum’s nodes must retain. Glamsterdam changes the gas charged for that work, as well as for accessing exist...