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EVENT / TOPICHistorical

Ethereum Foundation delays Glamsterdam upgrade on Hoodi testnet due to security concerns

4 reports3 sources10/23/2026 updated

Current overview (not historical)

AI overview

The Ethereum Foundation postponed the Glamsterdam upgrade on the Hoodi testnet after ChainSecurity flagged on Oct. 13 that EIP-8037 and EIP-8038 could weaken safeguards against insufficient gas griefing, allowing gas to be returned on failed operations and potentially interfering with existing contract safety checks. The upgrade was originally scheduled for Oct. 26, 2026 at 17:42:48 UTC with a 200 million gas target, but was delayed to further investigate the EIP-8037 interaction issues with mainnet contracts.

Written with AI from the reporting · updated 10/23/2026

Latest developmentOct 23, 13:09
Ethereum delays Glamsterdam Hoodi testnet launch due to gas-related security risks
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Expand the detailed fact route and sources

Story route

A station-by-station route from the first public evidence onward; every station carries its own evidence and uncertainty.

  1. 1Unclassified fact stationOct 16, 00:00recorded Oct 17, 02:50single sourcerevised

    Glamsterdam Hoodi Testnet Announcement

    Read original source ↗ Ethereum Foundation BlogReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    ethereum
    Action：
    announce
    Object：
    Glamsterdam upgrade activation on Hoodi
    Occurred (fact side)：
    Oct 16, 00:00
    Ethereum Foundation Blog ↗Report pageRevision 3 · currently revised
    Published (valid side)：
    Oct 16, 08:00
    First seen (known side)：
    Oct 17, 02:50
    Fact stationSingle source · one-sided claimRevised

    Copy may have been revised later; time replay is bounded. Layer labels group reading only, not causation between layers.

  2. 2Unclassified fact stationOct 26, 00:00recorded Oct 18, 01:12single sourcerevised

    Ethereum sets October 26 for Hoodi’s 200 million gas test

    Read original source ↗ CryptoSlateReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    ethereum
    Action：
    sets
    Object：
    October 26 for Hoodi’s 200 million gas test
    Occurred (fact side)：
    Oct 26, 00:00
    CryptoSlate ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 18, 01:00
    First seen (known side)：
    Oct 18, 01:12
    Fact stationSingle source · one-sided claimRevised

    Copy may have been revised later; time replay is bounded. Layer labels group reading only, not causation between layers.

  3. 3Unclassified fact stationOct 22, 00:00recorded Oct 23, 02:10single sourcerevised

    Glamsterdam upgrade on Hoodi postponed

    Read original source ↗ Ethereum Foundation BlogReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    Hoodi testnet
    Action：
    upgrade postponed
    Object：
    Glamsterdam network upgrade
    Occurred (fact side)：
    Oct 22, 00:00
    Ethereum Foundation Blog ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 22, 08:00
    First seen (known side)：
    Oct 23, 02:10
    Fact stationSingle source · one-sided claimRevised

    Copy may have been revised later; time replay is bounded. Layer labels group reading only, not causation between layers.

  4. 4Unclassified fact stationOct 23, 00:00recorded Oct 23, 13:26single sourcerevised

    Ethereum delays Glamsterdam Hoodi testnet launch over securi

    Read original source ↗ CointelegraphReplay this moment in the explorer
    Evidence & revisions · 1 source records
    Subject：
    ethereum
    Action：
    delayed the Glamsterdam hard fork on the Hoodi testnet
    Object：
    Glamsterdam hard fork on Hoodi testnet
    Occurred (fact side)：
    Oct 23, 00:00
    Cointelegraph ↗Report pageRevision 2 · currently revised
    Published (valid side)：
    Oct 23, 13:09
    First seen (known side)：
    Oct 23, 13:26
    Fact stationSingle source · one-sided claimRevised

    Copy may have been revised later; time replay is bounded. Layer labels group reading only, not causation between layers.

Uncertainty marks flag where to check the sources; they are not proven causation.

Report timeline

Explore every side through dated source reports.

Oct 23
  1. CointelegraphRelated fact: single sourceSource report revised
    Ethereum delays Glamsterdam Hoodi testnet launch due to gas-related security risks

    Report first recorded Oct 23, 13:26

    Ethereum developers postponed the Glamsterdam hard fork on the Hoodi testnet from October 26 to allow investigation into gas-related security risks, as warned by ChainSecurity on October 13. ChainSecurity noted that EIP-8037 and EIP-8038 could weaken safeguards against insufficient gas griefing because gas might be returned to a contract after a failed operation, potentially interfering with existing security checks that rely on remaining gas. This postponement raises uncertainty over Glamsterdam’s mainnet timeline.

    Read original source ↗
Oct 22
  1. Ethereum Foundation BlogFirst-party sourceRelated fact: single sourceSource report revised
    Glamsterdam upgrade on Hoodi testnet postponed pending EIP-8037 investigation

    Report first recorded Oct 23, 02:10

    The Glamsterdam upgrade on the Hoodi testnet, originally scheduled for October 26, 2026 at 17:42:48 UTC, has been postponed with no new activation date set. Core developers decided on ACDE #248 to delay the upgrade to allow further investigation into the interactions of EIP-8037 with mainnet smart contracts, which removes the scheduled Amsterdam execution layer activation, Gloas consensus layer activation, and the gas-limit increase to 200M. Node and validator operators must update their software configurations to reflect the postponement and await a separate announcement for the revised schedule; this only affects the Hoodi testnet, not the Ethereum mainnet.

    Read original source ↗
Oct 18
  1. CryptoSlateRelated fact: single sourceSource report revised
    Ethereum sets October 26 deadline for Hoodi testnet's 200 million gas target

    Report first recorded Oct 18, 01:12

    Ethereum has scheduled the Hoodi testnet activation for October 26, 2026, at 17:42:48 UTC, setting a 200 million gas target to guide a gradual block-limit adjustment. All Hoodi operators must update execution and consensus clients, while validators are required to upgrade their beacon node and validator client. The mainnet activation timing remains undecided, and ETH holders are not required to take any action as a result of this testnet update.

    Read original source ↗
Oct 16
  1. Ethereum Foundation BlogFirst-party sourceRelated fact: single sourceSource report revised
    Ethereum Foundation activates Glamsterdam upgrade on Hoodi testnet

    Report first recorded Oct 17, 02:50

    The Ethereum Foundation activated the Glamsterdam network upgrade on the Hoodi testnet at epoch 132,352 and slot 4,235,264 (October 26, 2026, 17:42:48 UTC). The upgrade introduces enshrined proposer-builder separation (ePBS) and block-level access lists (BALs) to improve L1 throughput, and raises the gas limit to 200 million. Gas pricing is also adjusted via EIP-8037 and EIP-8038 to better reflect execution and state growth costs.

    Read original source ↗

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