Ethereum activates Glamsterdam on Sepolia next week with a 200M gas target, protocol-managed block building and parallel execution ahead of a Q4 mainnet window.

Ethereum's Glamsterdam upgrade is set to activate on the Sepolia testnet on October 6, 2026, at 13:53:36 UTC. The release combines the Amsterdam execution layer and Gloas consensus layer upgrades, introducing enshrined proposer-builder separation and block-level access lists to boost L1 throughput.