Ethereum Glamsterdam Upgrade Scheduled for Sepolia Testnet on October 6
nashnova research
Ethereum's next major upgrade, Glamsterdam, will activate on the Sepolia testnet on October 6. The headline change embeds block-building into the protocol itself — a critical live test before mainnet deployment.
What does this upgrade actually change?
The centerpiece is proposer-builder separation (PBS) written into the protocol layer. Today, the handoff between specialized block builders and validators relies on external middleware; after the upgrade, this process is embedded directly in Ethereum's own protocol.
This means → Ethereum stops outsourcing a critical step in block production to third-party tools. The protocol itself controls the entire flow, raising both security and reliability.
In plain terms = the company's full-time staff no longer need to borrow an outside contractor's tools to do their job — the tools are now in-house.
What else changes under the hood?
The upgrade introduces block-level access lists that log every account and storage slot touched during a block's execution — essentially a usage ledger for each block.
Gas pricing is recalibrated to more accurately reflect the real cost of creating and accessing data on Ethereum.
This means → smart contracts that rely on fixed gas subsidies or hard-coded gas limits may break. The Ethereum Foundation has already warned developers to audit and update affected contracts.
Why Sepolia first?
Sepolia is Ethereum's public testnet. The October 6 activation is the key prerequisite before Glamsterdam can advance to mainnet.
The Ethereum Foundation requires Sepolia node operators to update both execution-layer and consensus-layer clients before activation — nodes that don't update will be unable to participate.
Developers have not yet announced a timeline for Glamsterdam on the Hoodi testnet or mainnet. Whether the upgrade passes Sepolia testing on schedule will be a closely watched signal of Ethereum's protocol-evolution pace.
What comes after Glamsterdam on the roadmap?
Developers have targeted 2027 for the next upgrade, Hegotá.
Vitalik Buterin said Hegotá may be Ethereum's last "regular" hard fork before the development focus shifts to recursive STARKs, automated formal verification, consensus optimization, and post-quantum cryptography.
This means → Glamsterdam and Hegotá together represent the closing chapter of Ethereum's "routine upgrade" era. After that, development enters a deeper cryptographic and security-architecture overhaul — longer cycles and higher complexity.
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