Ethereum still aims for October 6 at 13:53 UTC to activate Glamsterdam on the Sepolia testnet. The date now appears as the next milestone on Ethereum's official roadmap. But it remains fragile: Glamsterdam has not yet completed any full run on a stable private devnet, and several bugs must be fixed before exposing the update to Sepolia. The mainnet is still planned for the fourth quarter of 2026, with no confirmed date.