Ethereum’s development community has reached a significant milestone, moving the network’s most ambitious protocol upgrade in recent memory into its final phase of preparation. According to reports, work on the upgrade codenamed Glamsterdam is now entering a closed testing environment as developers push toward what could be a transformative moment for the world’s second-largest blockchain.
What Is Glamsterdam?
Glamsterdam represents a convergence of multiple planned improvements to the Ethereum protocol, bundled into a single fork. The upgrade is widely regarded as the most substantial overhaul Ethereum has undertaken in years, building on the momentum of previous forks that have reshaped how the network handles transactions, fees, and validator operations.
Developers are now running the upgrade on developer networks, or devnets, the early testing environments used to trial new code before it reaches public testnets. According to Ethereum Foundation core developer Parithosh Jayanthi, these devnets now contain the full set of Ethereum Improvement Proposals slated for the fork, marking the last phase before the codebase is hardened and shipped to public testnets. Jayanthi described Glamsterdam as probably the largest fork since the Merge, adding that it will change many assumptions about Ethereum and set the network up for far greater scaling.
Why This Upgrade Matters
Glamsterdam’s headline changes are two technical proposals. The first, enshrined Proposer-Builder Separation (EIP-7732), would move into Ethereum’s core protocol the separation between the entities that build transaction blocks and those that propose them. That process currently relies largely on off-chain arrangements that carry extra trust assumptions and centralization concerns. Bringing it on-chain is intended to reduce opportunities for manipulation tied to maximal extractable value, or MEV.
The second, Block-level Access Lists (EIP-7928), would let blocks declare in advance which accounts and smart-contract data they intend to access. That allows Ethereum clients to preload information more efficiently, making block execution faster and more predictable.
Glamsterdam also includes a sweeping set of gas repricings that could reshape the economics of using Ethereum. In Jayanthi’s words, high-level compute gets cheaper while state gets more expensive. The aim is to make fees better reflect the resources each operation consumes, while making the network easier to scale with zero-knowledge proving systems.
Development Process and Next Steps
Ethereum upgrades follow a structured path from proposal through testing to mainnet activation. No fixed activation date has been set, but Glamsterdam is currently expected to go live in the second half of the year. Entering the final development stage means the specification is considered largely stable, though edge cases and optimisations may still be resolved during testing.
Following the current closed environment phase, the upgrade is expected to proceed to public testnets where a wider set of validators, developers, and infrastructure providers can verify compatibility with their own systems. Only after successful testnet runs do Ethereum’s core developers typically set a mainnet activation block.
Community and Ecosystem Impact
Application developers, layer-two networks, and wallet providers will all be watching the testnet phases carefully. Major Ethereum upgrades have historically required coordinated preparation across the ecosystem, and Glamsterdam’s scope means that preparation window will be important.
Reports indicate that developer teams are already working in parallel to ensure the final stretch moves as smoothly as possible, with attention focused on execution risk now that the specification work is winding down.
For the broader crypto market, a well-executed Glamsterdam upgrade could serve as a meaningful catalyst for renewed confidence in Ethereum’s technical roadmap at a time when the asset has faced mixed price performance relative to Bitcoin.
