Ethereum Schedules Oct. 26 Hoodi Testnet Glamsterdam Upgrade With 200M Gas Target

The Ethereum Foundation announced on Oct. 16 that the Glamsterdam upgrade will activate on the Hoodi test network on Oct. 26, 2026, at 17:42:48 UTC, pairing block production and validation changes with a scheduled 200M gas target. The 200M gas target sets client defaults and recommendations for computational work per block while preserving operator preferences, meaning the actual block limit adjusts gradually under existing rules rather than acting as an instantly enforced ceiling. Following Glamsterdam's Oct. 6 activation on the Sepolia testnet, the Hoodi deployment requires testnet node operators and validators to update their execution and consensus software, though mainnet activation timing remains undecided and requires no action from $ETH holders or mainnet operators. Glamsterdam combines the Amsterdam execution upgrade with the Gloas consensus upgrade, introducing enshrined proposer-builder separation into the protocol and adding block-level access lists so clients can process more work in parallel. The Ethereum Foundation advised developers to test smart contracts and gas estimation under the updated rules, as changed gas pricing can affect contracts relying on fixed stipends, hardcoded limits, or remaining-gas assumptions.