Ethereum’s core developers have set December 3, 2025, as the mainnet deployment date for the Fusaka upgrade and October 30 as the proposal deadline for the next upgrade, Glamsterdam.
Ethereum core developers have proposed deploying the Fusaka upgrade on the mainnet on December 3, 2025. The next upgrade, Glamsterdam, will have a proposal deadline of October 30, with the final scope confirmed by November 27. These milestones are part of Ethereum's ongoing protocol improvements.