Ethereum's Glamsterdam upgrade is set to activate on the Hoodi test network on Oct. 26, 2026, giving node operators a deadline to update their software. The test pairs the upgrade with a 200 million gas target. Mainnet timing remains undecided.
Ethereum's Glamsterdam upgrade is scheduled for Hoodi on Oct. 26, 2026, at 17:42:48 UTC, a testnet whose operators now face a software deadline. The test pairs changes to block production and validation with a scheduled 200 million gas target.
The Ethereum Foundation's Oct. 16 announcement fixes the next testnet deployment after Glamsterdam's Oct. 6 activation on Sepolia. However, mainnet timing remains undecided, and ETH holders and mainnet operators have no action to take because of this Hoodi announcement.
What Hoodi operators must update
All Hoodi operators must update their execution and consensus clients before activation. Validators must update both the beacon node and validator client. They should also review new duties, builder-tooling compatibility and gas-limit settings.
The Foundation's confirmed releases, as checked Oct. 17, include Besu 26.10.0, Nethermind 2.2.0, Lodestar 1.50.0 and Prysm v7.3.0. Ethrex's listed version, 30.0.0-rc.2, is a release candidate. Grandine, Lighthouse, Erigon, go-ethereum and Reth remain unlisted, so operators should use releases whose notes confirm this Hoodi activation.
What the scaling test changes
The 200 million gas target is a planned budget for computational work per block. The gas-limit schedule sets client defaults and recommendations while preserving operator preferences. The actual block limit adjusts gradually under existing rules, so the target is not an instantly enforced ceiling.
Glamsterdam combines Amsterdam on the execution layer with Gloas on the consensus layer. Enshrined proposer-builder separation moves the exchange between block proposers and builders into the protocol and gives validators more time to check execution. Block-level access lists record accessed accounts, storage and state changes, so clients can perform more work in parallel.
Developers also have testing to do. Changed gas pricing can affect contracts that rely on fixed stipends, hardcoded limits or remaining-gas assumptions, and the Foundation advises testing contracts and gas estimation under the new rules.
Source: CryptoSlate
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