Ethereum core developers have postponed the Glamsterdam upgrade on the Hoodi testnet, originally scheduled for October 26, 2026. The decision came during All Core Devs Execution (ACDE) call #248, with the goal of allowing deeper investigation into how EIP-8037's gas accounting changes interact with existing mainnet smart contracts.
What the Delay Covers
The postponement removes three elements from the October 26 epoch: the Amsterdam execution-layer activation, the Gloas consensus-layer activation, and the planned raise of Hoodi's gas limit to 200 million. No replacement date has been set, though a new schedule will be announced separately.
The delay does not revert Hoodi's chain history, and mainnet users and ETH holders need take no action. Node and validator operators must update clients, including Lodestar, Besu, and Nethermind, to releases that explicitly confirm removal of the October 26 activation.
Security Concerns Behind the Decision
Security firm ChainSecurity flagged that EIP-8037's gas repricing could allow failure handlers to succeed in scenarios that previously reverted, potentially breaking assumptions in certain contracts.
The Glamsterdam upgrade had already activated on the Sepolia testnet on October 6 and remains unaffected by this Hoodi delay.
What Glamsterdam Encompasses
Glamsterdam is Ethereum's major layer-1 scaling upgrade for 2026. It combines enshrined proposer-builder separation via EIP-7732, block-level access lists via EIP-7928, and gas repricing under EIP-8037 and EIP-8038. Together, these changes aim to raise throughput and keep state growth sustainable.
Resolving EIP-8037 is expected to unlock a Q4 2026 mainnet window, with December remaining a candidate date. A revised Hoodi epoch is expected after Devcon, scheduled for November 3–6.
The Ethereum Foundation's broader roadmap remains intact. The Hegota upgrade targets 2027 stablecoin gas payments, and Ethereum continues work toward a fully quantum-resistant layer-1 by end-2029.
