Ethereum’s Glamsterdam upgrade clears rehearsal for October 6 test

Ethereum’s Glamsterdam upgrade just passed its latest private devnet rehearsal, clearing the way for a public testnet deployment on the Sepolia network tentatively scheduled for October 6, 2026, at 13:53 UTC. If all goes according to plan, the upgrade would land on mainnet sometime in Q4 2026, bringing with it one of the most aggressive capacity expansions in the network’s history. The target: nearly tripling Ethereum’s block gas limit from roughly 60 million to 200 million. What Glamsterdam actually changes The upgrade bundles two layers of improvements under one roof. On the consensus side, changes are grouped under the name Gloas. On the execution side, they fall under Amsterdam. Together, they form Glamsterdam, following the naming convention Ethereum has used since merging its upgrade tracks. The headline feature is enshrined proposer-builder separation, or ePBS, introduced through EIP-7732. Right now, Ethereum’s block production pipeline leans heavily on off-protocol MEV relays, third-party services that sit between validators and block builders to coordinate transaction ordering. These relays introduce centralization risks and trust assumptions. ePBS bakes that separation di...