Ethereum's Glamsterdam Upgrade Set for Sepolia Test on October 6, 2026

The Ethereum network's Glamsterdam upgrade is set to be tested on Sepolia on October 6, 2026. This test will activate epoch 353,024, slot 11,296,768 and implement EIP-7732's proposer-builder separation and settlement into the consensus protocol.

Glamsterdam combines the Amsterdam execution-layer upgrade with Gloas on the consensus layer. The activation is currently scheduled for Sepolia only, with Hoodi and mainnet dates yet to be decided.

EIP-7732's design separates consensus validation from execution validation, giving Ethereum validators more time to check execution payloads. A payload timeliness committee attests to whether the builder revealed the payload and whether its associated blob data was available on time.