Ethereum’s Glamsterdam upgrade successfully passed its latest private devnet rehearsal, clearing the way for public testnet deployment on the Sepolia network on October 6, 2026, at 13:53 UTC. The upgrade targets nearly tripling the block gas limit from roughly 60 million to 200 million units. Transaction fees are projected to drop by approximately 78.6 % through enshrined proposer-builder separation via EIP-7732 and block-level access lists via EIP-7928. Mainnet activation is targeted for Q4 2026. Previous devnet cycles had surfaced implementation bugs and finality issues that already caused timeline adjustments.
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