Ethereum developers have tentatively scheduled the Glamsterdam upgrade for Sepolia at 13:53 UTC on October 6, 2026, but the public-testnet fork remains dependent on successful private-network testing. Attention has shifted from the previously planned Devnet-10 to Devnet-11, scheduled for September 14, following finality problems on Devnet-9 and earlier consensus- and execution-layer bugs. Devnet-9, the largest Glamsterdam devnet at that stage with about 1,000 validator nodes, failed to finalize. Developers are also testing fixes for an EIP-8037 implementation issue affecting Ethereum's proposed state-creation gas charges. No dates have been confirmed for the Hoodi testnet or mainnet, though developers have discussed a possible December mainnet activation.