Original report published Nov. 6, 2026, at 21:23:08 UTC+8.
Ethereum core developers delayed the Glamsterdam upgrade’s rollout on the Hoodi testnet until security concerns involving eight smart contract invariants are resolved, according to an Ethereum Foundation blog post cited by Cointelegraph.
What triggered the delay?
An Oct. 13 report from smart contract auditor ChainSecurity found that two proposed changes, EIP-8037 and EIP-8038, could break contracts that depend on fixed gas-related assumptions when external calls fail.
The Ethereum Foundation said some existing projects assume certain operations will cost a specific amount of gas. The proposals would change how gas is charged for certain operations, invalidating those assumptions.
The delay gives developers more time to identify potentially affected contracts and determine whether changes are needed before Glamsterdam moves toward mainnet deployment. The Foundation said the Hoodi fork would not proceed until the issues are resolved.
Where Glamsterdam stands
Glamsterdam went live on the Sepolia testnet on Oct. 6, in one of its final major rehearsals. In a Sept. 28 blog post, the Foundation described the upgrade as part of Ethereum’s layer-1 scaling roadmap, with enshrined proposer-builder separation, block-level access lists and gas-pricing changes intended to better reflect execution costs.
The concern is compatibility: changes to gas charging could undermine assumptions embedded in existing contracts. The supplied report does not identify the affected projects or provide a revised Hoodi rollout date.