Ethereum’s Glamsterdam upgrade launches on Sepolia testnet

Sepolia marks one of the final major rehearsals before the final activation of Glamsterdam, aimed at bringing more efficiency and scalability to the Ethereum mainnet. Ethereum’s Glamsterdam upgrade has gone live on the Sepolia testnet, in one of the final major rehearsals before its mainnet activation. Glamsterdam went live on Sepolia on Tuesday at 1:53 pm UTC, Ethereum community contributor Pooja Ranjan announced in an X >post. The upgrade aims to advance Ethereum’s layer-1 scaling roadmap with enshrined proposer-builder separation, block-level access lists and changes to gas pricing that better reflect the cost of execution, the Ethereum Foundation announced in a Sept. 28 blog >post. The development marks one of the final testnet launches for Glamsterdam, arguably one of the most consequential upgrades of 2026, aiming to make the Ethereum network more scalable and efficient. Following the testnet launch, developers will determine Glamsterdam’s activation date on the Hoodi testnet, before determining the final date of its mainnet launch. Glamsterdam activation schedule. Source: Ethereum.org Glamsterdam marks the next major upgrade after Fusaka, designed to improve scalability, harden the layer-1 and make the network easier to use. The upgrade’s headliner changes are enshrined proposer-builder separation (ePBS) and block-level access lists (BALs), which change how blocks are produced and validated to support greater throughput on the Ethereum mainnet. Enshrined Proposer-Builder Separation, or >EIP-7732, introduces separation between block proposers and builders on Ethereum’s consensus protocol, while also separating consensus validation from execution validation, giving validators more time to validate execution payloads. Currently, Ethereum is running in single-lane mode, processing transactions in a single order. Parallel processing seeks to enable higher transactions per second on Ethereum and bigger block sizes, without raising the gas limit. Related: Ethereum Institutional signals support for Ethlabs’ motion to reduce Ethereum block times The second headliner change,

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