What happened
Developers pulled Glamsterdam activation in Hoodi from the schedule after warnings about gas costs; timelines for the mainnet are now undefined.
Why it matters
The cancellation of the test lowers the immediate checkpoint that had underpinned preparation for Glamsterdam’s mainnet launch and renders the prior schedule uncertain.
Ethereum developers cancelled the planned Glamsterdam upgrade activation in the Hoodi testnet on 26 October. According to Unchained, the decision was made several days before launch after ChainSecurity flagged gas-cost risks.
The cancellation affects the previously planned timeline: candidates for activating the upgrade on the mainnet in early December were counting on a successful pass of this test. The Defiant reports that node operators were invited to run software without the planned fork, and the mainnet launch date remains undetermined.
The practical takeaway remains limited for now: developers first need to reassess gas risks and define a new test order. There are no details in the available materials about the problematic component, the scale of the risk, or a new activation timeline.
Confirmed facts
- Developers cancelled the Hoodi testnet activation of Glamsterdam planned for 26 October 2026 year.
- The cancellation occurred days before the scheduled activation.
- Unchained's headline states that ChainSecurity flagged gas-cost risks.
- Early December mainnet activation candidates depended on passing this test.
- According to The Defiant, node operators were advised to run software without the planned fork.
- The activation date for Glamsterdam on the mainnet remains unresolved.
Context
Reports published 22 October 2026 year; the package contains two independent metadata summaries, but not the full texts of materials or Ethereum developers’ statements.
What remains unknown
- Which specific Glamsterdam component is associated with the flagged gas-cost risks?
- What changes will be required before retesting in Hoodi?
- When will developers set a new activation date for the testnet?
- Will the December timing for the mainnet remain the target?
Editorial context
Confidence: medium
A likely consequence is a revised Glamsterdam schedule and a postponement of core-network-related decisions until results from a new test are available. The nearest observable signal is a new date or description of a reactivation in Hoodi. Substantial uncertainty stems from the lack of details about the problematic component, the scope of the risk, or a new activation timeline.