The Ethereum Foundation announced on October 22, 2026, that the Glamsterdam upgrade scheduled for October 26, 2026, on Hoodi would no longer proceed.

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From the articleEthereum Delays Glamsterdam Testing After 13 Contracts Trigger ConcernsAlso in Ethereum delays Glamsterdam test after security devs flag risk to existing contracts, Ethereum Delays Glamsterdam Testnet Fork Over Gas Security Flaws - Decrypt, Ethereum's long-awaited Glamsterdam upgrade hits another roadblock as 13 security risks emerge, Ethereum Delays Oct 26 Glamsterdam Hoodi Upgrade Over Security Risks, Ethereum postpones Glamsterdam upgrade on Hoodi testnet over smart contract concerns, Ethereum Delays Glamsterdam Upgrade After Security Researchers Flag Risks, Ethereum Glamsterdam Upgrade Delayed Over Security Risks