Ethereum targets Oct. 6 for Glamsterdam on Sepolia

Ethereum developers have tentatively scheduled the Glamsterdam upgrade for activation on Sepolia at 13:53 UTC on Oct. 6, 2026, while another private devnet test remains necessary before the public testnet fork proceeds. Summary Ethereum developers have tentatively scheduled Glamsterdam’s Sepolia activation for October 6 at precisely 13:53 UTC. Glamsterdam has not completed stable activation on any private devnet, leaving Sepolia’s timing conditional still. Developers now plan Devnet-11 for September 14, replacing earlier expectations centered on Devnet-10 testing plans. Devnet testing exposed consensus and execution bugs, including an implementation issue connected with EIP-8037 code. No Hoodi or mainnet dates are confirmed, although developers have discussed a possible December activation. ACDC #186 meeting notes and subsequent reporting from Ethereum protocol researcher Christine D. Kim show that the date remains conditional. Developers had not completed a stable Glamsterdam activation on a private development network when they selected the Sepolia schedule. The testing plan has since moved forward by another iteration. Kim said on Sept. 11 that attention had turned to Glamsterda...