Ethereum core developers announced a delay to the Glamsterdam upgrade’s implementation on the Hoodi testnet on November 6, 2026, pending resolution of security concerns tied to eight smart contract invariants in two proposed enhancement requests.
The delay centers on EIP-8037 and EIP-8038, which modify how gas is charged for certain operations on the network. According to the Ethereum Foundation, “Some existing Ethereum projects rely on assumptions that certain operations would cost a specific amount of gas, which would be invalidated by Glamsterdam’s EIP-8037 and EIP-8038 because they change how gas is charged for certain operations.”
Smart contracts that depend on fixed gas-related assumptions for external call failures risk breaking under the new framework. The Hoodi testnet fork will not proceed until these issues are resolved, the foundation confirmed.
Earlier Testing Progress
Glamsterdam went live on the Sepolia testnet on October 6, 2026. The upgrade is designed to advance Ethereum’s layer-1 scaling roadmap through enshrined proposer-builder separation, block-level access lists, and the gas pricing changes now under scrutiny.
Smart contract auditor ChainSecurity published a report on October 13, 2026, detailing the compatibility risks. The report identified the eight invariants that could affect existing projects relying on legacy gas cost assumptions.
The Ethereum Foundation did not specify which projects are affected or provide a target date for resuming the Hoodi testnet fork once the issues are resolved.
