Ethereum core developers delayed the Glamsterdam upgrade’s deployment on the Hoodi testnet pending resolution of security concerns involving eight smart contract invariants, according to a Cointelegraph report published on November 6, 2026, at 21:23:08 UTC+8.
Gas-pricing changes could break contract assumptions
The Ethereum Foundation said in a Friday blog post that some existing Ethereum projects depend on assumptions about how much gas particular operations consume. Glamsterdam’s EIP-8037 and EIP-8038 would change how gas is charged for certain operations, invalidating those assumptions.
The decision followed an October 13 report by smart contract auditor ChainSecurity, which found that the two Ethereum Improvement Proposals could break contracts that rely on fixed gas-related assumptions when external calls fail.
Hoodi deployment remains on hold
The delay gives developers more time to identify potential contract issues and determine whether changes are needed before Glamsterdam moves toward mainnet deployment. The Ethereum Foundation said the Hoodi fork would not proceed until the issues were resolved.
Glamsterdam had already gone live on the Sepolia testnet on October 6, in one of its final major rehearsals. That testnet deployment did not mean the upgrade had been activated on mainnet.
In a September 28 blog post, the Foundation described Glamsterdam’s goals as advancing Ethereum’s layer-1 scaling roadmap through enshrined proposer-builder separation, block-level access lists and gas-pricing changes intended to better reflect execution costs.