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

According to reporting from Christine D. Kim (@christine_dkim), Ethereum developers confirmed at the ACDC #186 conference that the Glamsterdam upgrade will be activated on the Sepolia testnet on October 6 at 13:53 UTC. However, there is significant uncertainty surrounding this upgrade—the current latest private testnet, Glamsterdam-Devnet-9, has not yet stabilized. A severe vulnerability in the consensus layer could halt block production across the network, and a bug in the execution layer's EIP-8037 also requires fixing. Developers will release Devnet-10 in the coming weeks; if Devnet-10 remains unstable, the Sepolia upgrade date may be pushed back. Activation timelines for the Hoodi testnet and the mainnet have not yet been determined, and it remains uncertain whether the goal of launching on the mainnet before the end of the year will be met.