In a report published on November 10, 2026, ChainCatcher said Ethereum non-profit research organization Ethlabs had written that EIP-8037 and EIP-8038, part of the Glamsterdam upgrade, adjust gas costs and the billing mechanism and may affect some already deployed smart contracts.
Ethlabs recommends holding off on changing the upgrade specification, and on setting a fork date for the Hoodi testnet, until external audit results are published and the related effects are clear. The final decision is for the Ethereum core developers meeting (ACD).
Two external audits commissioned by the Ethereum Foundation, from ChainSecurity and Dedaub, were expected to be published before November 16. On that same day, an ACD testing meeting was to hold a public Q&A. The ACD execution-layer meeting on November 19 was expected to discuss the audit results and might decide whether to modify the upgrade specification.
Glamsterdam is meant to raise Ethereum’s per-block gas limit from 60 million to 200 million. Ethlabs said gas-cost changes may affect contracts and tools that hardcode operation costs. Billing-mechanism changes could also make some deployed contracts behave unexpectedly: after an internal call reverts, the remaining gas returned by gasleft() can increase instead, which can affect a contract’s check of whether the call failed because it ran out of gas.
Original report: ChainCatcher, November 10, 2026, 17:48 (UTC+8).