Ethereum schedules Glamsterdam for Sepolia testnet on October 6
Ethereum developers confirmed that the Glamsterdam upgrade will activate on the Sepolia testnet on October 6, and they warned that cheap test ether could let attackers create fake builder identities, win ePBS block auctions, and then refuse to hand over payloads. Client teams must release Sepolia-ready software by September 29, giving developers only seven days to review and bounty-test code. A recent rehearsal, Devnet-11, completed a Gloas transition and raised a test gas limit from 60 million to 200 million while keeping finality. No mainnet date is set; the public roadmap still points to fourth quarter 2026.
Glamsterdam will run on Sepolia testnet on October 6.
Context
Developers ran Devnet-11 as a rehearsal and it succeeded. They then picked October 6 for a Sepolia public test. If Sepolia goes well, Hoodi may follow and mainnet timing remains unspecified.
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