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Ethereum & L2s · 1 min read

Ethereum Schedules Glamsterdam Upgrade for Sepolia Testnet on Oct. 6

The testnet hard fork brings enshrined proposer-builder separation, block-level access lists, and a scheduled 200M gas limit at epoch 353,024.

Editorial oversight: Julian Mercer, Chief Editor
Neutral
$ETH $2,716 +0.1%

At a glance

What happened
Ethereum core developers scheduled the Glamsterdam upgrade to trigger on Sepolia at epoch 353,024 on October 6, 2026 [1].
Why it matters
The upgrade activates enshrined proposer-builder separation, block-level access lists, and a 200M testnet gas target [1], [2].
Who is affected
Sepolia node operators, testnet validator runners, and developers testing contracts sensitive to gas repricing [1].
Takes effect
October 6, 2026, 13:53:36 UTC
What's next
Client teams will determine activation timetables for the Hoodi testnet and Ethereum mainnet [1].
Primary source
blog.ethereum.org: Glamsterdam Testnet Announcement

Key points

  • Glamsterdam activates on the Sepolia testnet at epoch 353,024 on October 6, 2026, at 13:53:36 UTC 1.
  • The fork introduces enshrined proposer-builder separation (EIP-7732) and block-level access lists (EIP-7928) 1.
  • Sepolia schedules a 200M block gas limit, though Prysm and Teku clients default to 60M without manual flags 1, 2.

Ethereum core developers have scheduled the Glamsterdam network upgrade to activate on the Sepolia testnet at epoch 353,024, slot 11,296,768, landing on October 6, 2026, at 13:53:36 UTC 1. The upgrade pairs the Amsterdam execution layer overhaul with the Gloas consensus layer release, succeeding the Fusaka hard fork on Ethereum's Layer-1 development roadmap 1. At the time of writing, $ETH changed hands at $2,710 amid broader market consolidation.

Glamsterdam incorporates enshrined proposer-builder separation (ePBS) via EIP-7732 and enforced block-level access lists (BALs) under EIP-7928 1. Under ePBS, the Ethereum consensus protocol directly manages validator proposer commitments and builder payload payments, removing reliance on external relay middleware and segregating consensus checks from execution validation 1. BALs log accessed accounts, storage slots, and post-transaction state alterations, enabling client software to execute parallel transaction validation and accelerate state root computation 1. Alongside these structural mechanisms, a Sepolia configuration commit schedules a block gas limit jump to 200,000,000 gas starting at epoch 353,024 2.

Client Requirements and Gas Overrides

Node operators running Sepolia validators must upgrade both execution and consensus clients prior to the activation timestamp 1. Compatible consensus client releases include Grandine 3.0.0-rc.0, Lighthouse 8.3.0-rc.0, Lodestar 1.49.0, Nimbus 26.10.0, Prysm 7.2.0, and Teku 26.9.1 1. On the execution side, teams have validated Besu 26.9.0, Ethrex 29.0.1, Erigon 3.7.1, go-ethereum 1.17.7, Nethermind 2.1.0, and Reth 2.7.0 1.

Notably, client teams documented that Prysm 7.2.0 and Teku 26.9.1 default to a 60,000,000 gas limit post-activation; node runners wishing to propose blocks matching the 200M target must configure explicit flags or v2 proposer settings 1, 2. The upgrade also introduces separate metering and higher costs for state creation under EIP-8037 and updates access expenses via EIP-8038 1. Application developers relying on static gas limits or fixed gas stipends must audit their smart contracts accordingly 1. Activation timetables for the Hoodi testnet and Ethereum mainnet remain unconfirmed 1.

Questions this story raises

Do Ethereum mainnet node operators or ETH holders need to update software?
No. The scheduled activation applies strictly to the Sepolia testnet. Mainnet and Hoodi activation schedules will be decided and announced separately [1].
What is the primary operational change for Sepolia validators?
Stakers must upgrade both consensus and execution clients before slot 11,296,768, review ePBS payload timeliness duties, and adjust flags if targeting a 200M proposing gas limit [1], [2].

Sources

  1. [1] Glamsterdam Testnet Announcement — blog.ethereum.org, October 6, 2026
  2. [2] Schedule 200m gas limit at the Glamsterdam upgrade (#130) · eth-clients/sepolia@237ad0d — github.com, October 6, 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: corrections@basisdesk.news · corrections policy.

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