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Story thread · 22 updates · September 29, 2026 → November 6, 2026

Ethereum Advances Glamsterdam Hard Fork Across Testnets

Where things stand · updated Nov 6

Ethereum core developers are progressing with the multi-phase rollout of the Glamsterdam upgrade, which merges the Amsterdam execution layer updates and Gloas consensus changes. The combined hard fork introduces enshrined proposer-builder separation (ePBS), block-level access lists, and a 200M gas limit schedule aimed at scaling Layer 1 capacity [2, 6].

Following its activation on the Sepolia testnet at epoch 353,024 on Oct. 6, 2026, client teams pushed stability fixes, including Geth v1.17.8 to mitigate denial-of-service vectors and peer-to-peer crash risks tied to Amsterdam logic [6, 7, 8]. Prysm also shipped v7.2.1 to configure cell-level data dissemination under PeerDAS by default [5].

Testing now shifts to the Hoodi testnet. Developers scheduled Hoodi activation for epoch 132,352 on Oct. 26, 2026, which will replicate the 200M gas limit and ePBS architecture validated on Sepolia [12, 13]. Successful execution on Hoodi serves as the final planned testnet stage before core developers schedule Glamsterdam for mainnet deployment [1, 12].

Timeline

  1. Ethereum Delays Glamsterdam Upgrade on Hoodi Testnet Over Smart Contract Vulnerabilities

    Core developers postponed the Oct. 26 activation after auditors found that gas pricing changes would break invariants relied upon by certain projects.

  2. Ethereum Core Developers Delay Glamsterdam Upgrade Over Smart Contract Vulnerabilities

    Chainsecurity discovered broken invariants caused by EIP-8037 and EIP-8038, prompting developers to postpone the Hoodi testnet hard fork.

  3. Geth Delays Amsterdam Hard Fork on Hoodi Testnet in v1.17.10 Release

    Ethereum client developers postpone the scheduled Oct. 26 upgrade on the Hoodi test network, requiring node operators to patch.

  4. Ethereum Core Developers Postpone Glamsterdam Upgrade on Hoodi Testnet

    Engineers delayed the scheduled Oct. 26 deployment to examine how EIP-8037 interacts with mainnet smart contracts, leaving a new activation epoch unset.

  5. Ethereum Client Teams Unschedule Hoodi Testnet Glamsterdam Upgrade

    Developers revert the planned Oct. 26 activation across client configurations following the ACDE 248 call.

  6. Ethereum Developers Cancel Oct. 26 Glamsterdam Upgrade on Hoodi Testnet

    Node operators were advised to run client software without the scheduled fork while mainnet deployment timing remains undecided.

  7. Solana Activates Alpenglow Upgrade on Mainnet, Ethereum Schedules Glamsterdam for Hoodi Testnet

    Solana's consensus overhaul drops finality to 150ms on mainnet, while Ethereum advances its L1 scaling roadmap on the Hoodi testnet.

  8. Ethereum Client Geth Releases v1.17.9 Ahead of Amsterdam Testnet Fork

    Go-Ethereum developers rolled out v1.17.9, scheduling the Amsterdam fork on the Hoodi testnet for Oct. 26 and adding key EVM optimizations.

  9. Solana Activates Alpenglow Consensus Upgrade on Mainnet

    The protocol-level overhaul targets sub-second finality of 150 milliseconds, moving validator voting off-chain and replacing variable fees with a flat epoch admission cost.

  10. Ethereum Schedules Glamsterdam Upgrade for Hoodi Testnet Activation on Oct. 26

    Following its activation on Sepolia, Ethereum core developers have set epoch 132,352 for Hoodi testnet deployment, raising its gas limit to 200M.

  11. Ethereum Schedules Glamsterdam Upgrade on Hoodi Testnet for Oct. 26

    The testnet deployment follows Sepolia activation and introduces enshrined proposer-builder separation and block-level access lists alongside a 200M gas limit.

  12. Solana Schedules Alpenglow Consensus Upgrade for Oct. 21

    The shift from TowerBFT to Votor replaces onchain vote transactions and targets roughly 150-millisecond finality.

  13. Ethereum Activates Glamsterdam Upgrade on Sepolia Testnet

    The testnet launch targets a massive increase in the block gas limit to 200 million, alongside the introduction of enshrined proposer-builder separation.

  14. Ethereum Foundation Details L1 Cost Reductions and Roadmap Through Glamsterdam

    Recent hard forks pushed Ethereum base-layer gas fees to fractions of a gwei, shifting app architecture ahead of scheduled capacity upgrades.

  15. Ethereum Core Developers Release Geth v1.17.8 to Patch Post-Amsterdam DoS Vectors

    The security update addresses denial-of-service vulnerabilities tied to Amsterdam hard fork logic and resolves peer-to-peer crash risks.

  16. Ethereum Glamsterdam Upgrade Activates on Sepolia Testnet

    The major network upgrade introduces enshrined proposer-builder separation and block-level access lists to advance Layer 1 scaling.

  17. 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.

  18. Prysm Releases v7.2.1 With PeerDAS Partial Columns Ahead of Sepolia Gloas Fork

    The update enables cell-level data dissemination by default and sets a 200M gas limit schedule for the Oct. 6 Sepolia fork.

  19. Ethereum Core Developers Release Geth v1.17.7 Ahead of Sepolia Amsterdam Fork

    The rapid update fixes Ubuntu package distribution issues and introduces custom history pruning controls ahead of the testnet activation on Oct. 6, 2026.

  20. Ethereum Schedules Glamsterdam Upgrade for Sepolia Testnet on October 6

    The upcoming upgrade combines the Amsterdam and Gloas updates, introducing enshrined proposer-builder separation and block-level access lists to scale Layer 1 execution.

  21. 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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