Ethereum core developers delayed the Glamsterdam upgrade’s deployment on the Hoodi testnet until security concerns involving eight smart contract invariants are resolved, according to the Ethereum Foundation.
The delay, reported by Cointelegraph on Nov. 6, 2026, at 21:23:08 UTC+8, gives developers more time to identify potential compatibility problems and determine whether changes are needed before the upgrade advances toward mainnet deployment.
Why gas-pricing changes raised concerns
In a Friday blog post, the Ethereum Foundation said some existing Ethereum projects depend on assumptions that certain operations will cost a specific amount of gas. Glamsterdam’s EIP-8037 and EIP-8038 change how gas is charged for certain operations, invalidating those assumptions.
The decision followed an Oct. 13 report by smart contract auditor ChainSecurity, which found that the two proposals could break contracts relying on fixed gas-related assumptions when external calls fail. That finding describes a potential compatibility risk, not a report that those contracts had already failed.
The Foundation said the Hoodi fork would not proceed until the issues were resolved.
Scaling plans remain subject to testing
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 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.
The Hoodi delay highlights the compatibility work involved in that roadmap. The report concerns upgrade testing and contract risk; it provides no user-growth, network-usage or retention figures from which to assess adoption.
