Ethereum is advancing its next protocol upgrade cycle with Glamsterdam set to go live on the Sepolia testnet on Oct. 6. The change affects node operators and developers because it updates core transaction handling, block building and gas pricing ahead of any later mainnet rollout.
Highlights
- Ethereum's Glamsterdam testnet upgrade will activate on Sepolia on Oct. 6, requiring node operators to update both execution-layer and consensus-layer clients.
- Glamsterdam introduces enshrined proposer-builder separation, block-level access lists, and revised gas pricing, potentially impacting contracts with fixed gas logic.
- Developers have not scheduled validator-focused Hoodi testnet or mainnet rollouts, with the next major roadmap event targeting Hegotá in 2027.
Sepolia activation and protocol changes
As reported by Cointelegraph, citing the Ethereum Foundation, Sepolia node operators must update both their execution-layer and consensus-layer clients before Glamsterdam activates on Oct. 6.A key feature in the upgrade is enshrined proposer-builder separation, which moves the handoff between specialized block builders and validators into Ethereum’s protocol. That shift is designed to reduce dependence on external middleware in block production.
Glamsterdam also introduces block-level access lists, which record the accounts and storage locations used during each block. In addition, the upgrade changes gas pricing so that it better reflects the cost of creating and accessing data on Ethereum, and the foundation says contracts that rely on fixed gas stipends or hardcoded gas limits may need changes.
Development roadmap and ecosystem impact
Developers have not set rollout dates for the validator-focused Hoodi testnet or for Ethereum mainnet, leaving the Sepolia activation as the next defined milestone in the upgrade path.The broader roadmap extends beyond Glamsterdam. Developers are targeting 2027 for Hegotá, the upgrade expected to follow it, while Ethereum co-founder Vitalik Buterin says Hegotá could be the network’s last normal fork before development shifts toward recursive STARKs, automated formal verification, optimized consensus and quantum-safe cryptography.
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