The Glamsterdam upgrade successfully activated on the Sepolia testnet on October 6, 2026, running with a gas limit of approximately 200 million.

From the articleEthereum Delays Glamsterdam Testing After 13 Contracts Trigger ConcernsAlso in Ethereum Glamsterdam Delay: ChainSecurity Flags 13 Contracts Where Failures Turn Permanent, Ethereum Delays Glamsterdam Upgrade After Security Researchers Flag Risks, Ethereum Delays Oct 26 Glamsterdam Hoodi Upgrade Over Security Risks, Ethereum delays Glamsterdam test after security devs flag risk to existing contracts, Ethereum Delays Glamsterdam Testnet Fork Over Gas Security Flaws - Decrypt