Ethereum activates Glamsterdam upgrade on Sepolia on October 6, 2026

The Glamsterdam network upgrade, combining the Amsterdam execution layer and Gloas consensus layer upgrades, is scheduled to activate on Sepolia at epoch 353,024, slot 11,296,768 (October 6, 2026, 13:53:36 UTC). Key changes include enshrined proposer-builder separation (ePBS) via EIP-7732 and block-level access lists (BALs) via EIP-7928, which aim to support greater L1 throughput. Additionally, gas accounting is adjusted through EIP-8037 and EIP-8038 to better reflect state creation and access costs. Node operators must update both execution and consensus layer clients before activation.