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Basis Desk
Tech & Protocols · 1 min read

Ethereum Schedules Glamsterdam Upgrade for Sepolia Activation on Oct. 6

The testnet hard fork introduces enshrined proposer-builder separation and block-level access lists ahead of Hoodi and mainnet rollouts.

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$ETH $2,704 +2.3%

Key points

  • Glamsterdam activates on the Sepolia testnet on Oct. 6, 2026, at epoch 353,024 and slot 11,296,768.
  • The fork introduces enshrined proposer-builder separation (EIP-7732) and block-level access lists (EIP-7928).
  • Gas accounting updates under EIP-8037 and EIP-8038 increase the costs of state creation and adjust state access.

The Ethereum Foundation announced on Sept. 28 that the Glamsterdam network upgrade is scheduled to activate on the Sepolia testnet on Oct. 6, 2026, at 13:53:36 UTC 1. The activation will take place at epoch 353,024 and slot 11,296,768 1. Glamsterdam merges the Amsterdam execution layer upgrade with the Gloas consensus layer upgrade, marking the next phase in Ethereum's Layer-1 scaling roadmap following Fusaka 1.

The upgrade features two primary architectural changes: enshrined proposer-builder separation (ePBS) via EIP-7732 and block-level access lists (BALs) under EIP-7928 1. EIP-7732 embeds the separation of block proposers and builders directly into the consensus protocol, handling proposer payouts automatically and reducing reliance on trusted external middleware 1. This mechanism also splits consensus validation from execution validation, establishing a payload timeliness committee to verify builder payload and blob data availability 1. Meanwhile, EIP-7928 enforces block-level access lists, enabling node clients to read disk state and validate transactions in parallel 1.

Gas Repricing and Client Requirements

Glamsterdam also modifies gas accounting to address state growth and resource consumption 1. EIP-8037 raises and separately meters the cost of creating state, while EIP-8038 adjusts state-access costs 1. Additional scheduled changes include EIP-7708, which makes $ETH transfers emit logs, alongside adjustments to intrinsic gas, access list costs, and contract size limits 1. Developers relying on hardcoded gas stipends or assumptions about remaining gas must test their contracts against the updated rules 1.

Sepolia node operators and validators must upgrade both execution and consensus clients prior to the activation epoch 1. Deployment dates for the Hoodi testnet and Ethereum mainnet have not yet been determined and will be announced once client teams confirm readiness 1. At the time of writing, $ETH traded at $2,722.

Questions this story raises

Does this upgrade affect Ethereum mainnet users or ETH holders?
No. The scheduled Oct. 6 activation applies exclusively to the Sepolia testnet. Mainnet and Hoodi activation schedules will be decided and announced at a later date.
What must Sepolia node operators do?
Operators running non-staking nodes or validators on Sepolia must update both their consensus layer and execution layer clients to compatible versions before Oct. 6, 2026, at 13:53:36 UTC.

Sources

  1. [1] Glamsterdam Testnet Announcement — Ethereum Foundation Blog, September 28, 2026

Written by Basis Desk's newsroom system from the primary sources above and machine-verified against them before publication. Market figures marked "at the time of writing" come from live exchange data. Report an error: hello@basisdesk.news.

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