Ethereum's Glamsterdam enters final dev phase before…

Ethereum developers have entered the final development phase of Glamsterdam, the network's most ambitious protocol upgrade since the Merge, with devnets now running the full suite of planned Ethereum Improvement Proposals. "This is the last phase before we work on hardening and then shipping the testnets. There's no fixed timeline, but we've made massive progress," said Parithosh Jayanthi, core developer and devops engineer at the Ethereum Foundation. Glamsterdam is expected to go live in the second half of 2025.

Why it matters

Jayanthi described Glamsterdam as "probably the largest fork we've had since the Merge," one that will "change a lot of assumptions about Ethereum and set us up for much more scaling in the future." The headline features are enshrined Proposer-Builder Separation (ePBS, EIP-7732) and Block-level Access Lists (EIP-7928). ePBS moves the block-building and block-proposing separation from offchain infrastructure onto Ethereum's core protocol, directly targeting MEV manipulation and centralization risks. Block-level Access Lists allow blocks to declare in advance which accounts and smart-contract storage they will touch, enabling clients to preload data and execute blocks faster and more predictably.

Market impact

Beyond the structural changes, Glamsterdam carries a sweeping set of gas repricings that Jayanthi says will "majorly change the cost of actions on Ethereum — high-level compute gets cheaper and state gets more expensive." The repricing is designed to align fees with actual resource consumption and to make Ethereum more compatible with zero-knowledge proving systems, a prerequisite for the next wave of scaling.