Ethereum developers have called off the Glamsterdam upgrade on the Hoodi testnet, which was due to activate on Monday, October 26, after security researchers flagged a risk that a gas-accounting change could permanently alter existing contracts, according to CoinDesk.
Summary
- The Glamsterdam fork on the Hoodi testnet, scheduled for October 26 at 17:42:48 UTC (epoch 132,352), has been postponed.
- Security firm ChainSecurity showed that EIP-8037 combined with EIP-8038 could make failed contract operations permanent.
- A planned test of 200 million gas per block was also cancelled, and no replacement date has been announced.
- Ethereum developer Alex Stokes confirmed the delay on X; Lido is planning a vote on rolling back Hoodi.
The decision was taken at Thursday’s All Core Devs Execution call (ACDE #248). The Ethereum Foundation announced the postponement on October 22, four days before the fork was due to activate. No new activation date has been set, and the mainnet upgrade timetable remains unconfirmed.
A repricing that could not be undone
The concern centers on EIP-8037, which reprices the cost of creating new state, combined with EIP-8038. ChainSecurity demonstrated that together the changes could cause state changes from failed contract operations to persist instead of being rolled back — behavior that could break assumptions built into existing deployed contracts.
Core developer Alex Stokes announced the postponement on X.
Testing plans rolled back
A stress test of blocks carrying 200 million gas, planned as part of the Hoodi run, was also cancelled. Liquid staking protocol Lido is planning a governance vote on rolling back the Hoodi testnet state as part of the recovery path.
The delay pushes the Glamsterdam test schedule back by weeks at least. Developers have not said when Hoodi will be re-forked, and until a new testnet date is fixed, the window for the mainnet upgrade — previously the next major step on Ethereum’s roadmap — stays open.
