The Ethereum Glamsterdam upgrade is scheduled for activation on the Sepolia testnet on October 6, with the mainnet timeline remaining unclear.

TechFlow reports that on September 11, according to Christine D. Kim (@christine_dkim), Ethereum developers confirmed at the ACDC #186 conference that the Glamsterdam upgrade will activate on the Sepolia testnet at 13:53 UTC on October 6. However, there is significant uncertainty surrounding this upgrade—the latest private testnet, Glamsterdam-Devnet-9, is not yet stable. A critical vulnerability in the consensus layer has been identified that could halt block production across the entire network, and a bug in execution layer EIP-8037 also requires fixing. Developers will launch Devnet-10 in the coming weeks; if Devnet-10 remains unstable, the Sepolia upgrade date may be delayed. The activation schedules for the Hoodi testnet and mainnet have not yet been determined, and whether the goal of launching on the mainnet by year-end will be achieved remains uncertain.