Glamsterdam Hoodi Fork: Lighthouse Upgrade and Builder Testing
Ethereum’s Glamsterdam upgrade is scheduled to fork on the Hoodi testnet on 26 October 2026 at 17:42 UTC. Node operators must upgrade to Lighthouse v8.3.1 or later and use a Glamsterdam-ready execution client before the fork.
The upgrade introduces enshrined proposer-builder separation (ePBS, EIP-7732), separating the execution payload from the beacon block and bringing builders directly into the protocol. Proposers can receive bids from configured builders over HTTP or peer-to-peer gossip, without relying on a relay. Lighthouse’s experimental v8.4.0-rc.0 also supports bid streaming, which lets builders update bids before a proposal is made.
Sigma Prime’s Bombora builder will bid on Hoodi from the fork. Hoodi is the final public testnet before Ethereum’s planned mainnet deployment, giving validators and builders a chance to test configurations. The announcement concerns testnet infrastructure and does not report a mainnet launch or a change to ETH’s monetary policy.
Neutral
The announcement is primarily about an Ethereum testnet upgrade and client preparation, so its direct effect on ETH trading and broader market stability is likely limited. It does not announce a mainnet activation date, a change to ETH supply or monetary policy, or a new source of immediate demand. Traders may monitor the fork for technical issues, but the article reports no failure or disruption.
In the short term, attention may turn to whether Hoodi validators and builders upgrade successfully and whether ePBS works as intended. A smooth testnet fork could modestly improve confidence in Ethereum’s development and infrastructure; delays or serious bugs could weigh on sentiment, particularly for ETH and Ethereum-related assets. As with previous testnet and client-upgrade milestones, however, market moves tend to depend on whether the event changes expectations for the mainnet timeline or network performance.
Over the longer term, ePBS could alter block production, builder competition and payment arrangements. More direct bidding and bid streaming may support greater builder diversity and give proposers more options, while new implementation and operational risks remain. These are potential ecosystem effects rather than an immediate trading catalyst. Overall, the news is best viewed as a technical milestone with a neutral market impact unless subsequent testing materially changes expectations for Ethereum’s mainnet upgrade.