Glamsterdam Hoodi Testnet Announcement
Posted by Ethereum Foundation Protocol Cluster on October 16, 2026
Protocol Announcements
Following its activation on Sepolia on October 6, the Glamsterdam network upgrade is now scheduled for the Hoodi testnet. Glamsterdam advances Ethereum's L1 scaling roadmap with enshrined proposer-builder separation, block-level access lists, and changes to gas pricing that better reflect the cost of execution and state growth.
The Glamsterdam network upgrade is scheduled to activate on Hoodi at epoch 132,352, slot 4,235,264 (October 26, 2026, 17:42:48 UTC). At the same epoch, Hoodi's gas limit will be raised to 200M. See the activation table below for the deployment schedule. The mainnet activation date has not yet been decided.
Hoodi-compatible client versions will be added to the client release tables as they are confirmed. Node operators must update both their execution and consensus layer clients before activation.
Glamsterdam Overview
Glamsterdam combines the Amsterdam execution layer upgrade with the Gloas consensus layer upgrade. Its headlining changes are enshrined proposer-builder separation (ePBS) and block-level access lists (BALs), which change how blocks are produced and validated to support greater L1 throughput.
Enshrined Proposer-Builder Separation (EIP-7732)
This brings the separation between block proposers and builders into Ethereum's consensus protocol. A proposer includes a builder's commitment to an execution payload, and the builder subsequently reveals that payload. The protocol handles payment to the proposer, reducing reliance on trusted middleware for the exchange between proposers and builders.
The change also separates consensus validation from execution validation, giving validators more time to validate execution payloads. A payload timeliness committee attests to whether the builder revealed its payload and the corresponding blob data was available on time. Validator operators and teams maintaining builder infrastructure should review the new duties and interfaces before the upgrade.
Block-Level Access Lists (EIP-7928)
Enforced block-level access lists record the accounts and storage locations accessed during a block, together with post-transaction state changes. These lists allow clients to read state from disk in parallel, validate transactions in parallel, and compute state roots more efficiently.
Together, ePBS and BALs provide a foundation for scaling execution capacity while keeping block validation practical for node operators.
Gas Pricing and State Growth
Glamsterdam adjusts gas accounting to better reflect resource usage.
- EIP-8037 increases and separately meters the cost of creating state.
- EIP-8038 updates state-access costs.
Additional changes cover intrinsic transaction gas, calldata, access lists, and block gas accounting.
Application developers should test contracts and gas estimation against the new rules. Contracts that rely on fixed gas stipends, hardcoded gas limits, or assumptions about remaining gas may need changes. See the Glamsterdam repricing impact guide for affected-contracts search and testing guidance.
Developer and Validator Improvements
Glamsterdam also includes:
- ETH transfer logs
- A slot-number opcode
- A higher maximum contract size
- A deterministic factory contract
- New stack-manipulation instructions
Consensus changes include forward-compatible data structures, excluding slashed validators from proposing, and increased exit and consolidation churn.
The complete scheduled EIP list is below.
Glamsterdam Specifications
- EIP-7773 tracks the Glamsterdam upgrade.