Ethereum’s Glamsterdam upgrade launches on Sepolia testnet

Ethereum developers have activated the Glamsterdam upgrade on the Sepolia testnet, a key step in pre-mainnet validation ahead of the planned mainnet rollout. The Sepolia deployment went live at 1:53 pm UTC, according to an X post from contributor Pooja Ranjan, and is described by the Ethereum Foundation as one of the final major rehearsals before mainnet activation.

Glamsterdam's primary technical changes include enshrined proposer-builder separation (EIP-7732) and enforced block-level access lists (EIP-7928). EIP-7732 separates the roles of block proposers and builders and decouples consensus validation from execution validation, which is intended to give validators more time to check execution payloads. EIP-7928 requires blocks to include lists of accounts and storage locations touched during a block, plus post-transaction state changes, enabling clients to read and validate state in parallel and to compute state roots more efficiently.

The upgrade also adjusts gas pricing mechanics as part of a broader effort to better align costs with execution and to support increased throughput. The Ethereum Foundation previously signaled a 200 million gas limit floor for Glamsterdam, a substantial rise from the network's roughly 60 million gas limit at the time of that announcement. Together, these changes are intended to move Ethereum away from single-lane transaction processing toward greater parallelism and larger effective block capacity without simply raising the gas limit.

Following the Sepolia launch, developers will use the Hoodi testnet to choose Glamsterdam's activation date, then set the final mainnet launch date. After Glamsterdam goes live on mainnet, the Ethereum roadmap indicates Hegotá will be the next major upgrade, with developers already reviewing proposals for that phase, including items addressing privacy capabilities.