Ethereum
Ethereum Schedules Sepolia Glamsterdam Testnet Activation for October 6
Developers have set an October activation date for the Glamsterdam upgrade on the Sepolia testnet while assessing potential builder auction disruptions.
Ethereum core developers have scheduled the activation of the Glamsterdam upgrade on the Sepolia testnet for October 6, 2026, at 13:53:36 UTC, designated at epoch 353024 and slot 11296768. The testnet deployment serves as the initial public milestone ahead of a planned mainnet release targeted for the fourth quarter of 2026.
Glamsterdam is designed around protocol scaling improvements, centering on enshrined proposer-builder separation (ePBS) detailed in EIP-7732. The mechanism adjusts the block production process by having builders commit to execution payloads for subsequent delivery rather than supplying them immediately, with specialized committees monitoring delivery timeliness.
Developers and industry reports highlighted a testing risk inherent to Sepolia's environment. Because testnet ETH is distributed without cost and builder identities can be discarded, an actor could repeatedly win block-building auctions and deliberately withhold payloads. While this dynamic could interrupt the validation of auction mechanics during testing, developers noted the vulnerability is limited entirely to Sepolia and does not affect mainnet funds.
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