The Ethereum Foundation will activate the Glamsterdam upgrade on the Sepolia testnet on October 6.

BlockBeats news, September 29 — The Ethereum Foundation announced that the Glamsterdam network upgrade will activate on the Sepolia testnet at 21:53:36 Beijing time on October 6, 2026 (epoch 353,024, slot 11,296,768).

The activation times for Hoodi and mainnet have not yet been determined. This upgrade integrates the execution layer Amsterdam and the consensus layer Gloas. Core improvements include: enshrined proposer-builder separation (ePBS, EIP-7732), formally incorporating block proposal and building into the protocol; block-level access lists (BALs, EIP-7928), enabling parallel state reads and transaction validation; and adjustments to gas pricing to more accurately reflect execution and state growth costs (EIP-8037, EIP-8038, etc.).

Node operators need to update their execution layer and consensus layer clients before activation. Relevant client versions have been released successively; see the official announcement for the detailed compatibility list. Mainnet users and ETH holders do not need to take any action for now.