Ethereum's Glamsterdam upgrade activates on Sepolia testnet Oct. 6

Ethereum's upcoming Glamsterdam upgrade will activate on the Sepolia testnet on October 6, bringing built-in proposer-builder separation (ePBS), block-level access lists and gas pricing adjustments, with mainnet timing still to be confirmed. The test network previously raised its per-block work limit toward 200 million gas, a step developers frame as a large jump in network capacity.\n\n- Developers warn that free test ether lets "fake" builders outbid real ones and withhold transaction payloads, which could stall the chain during testing.\n- Client teams are getting half the usual review time before the Sepolia deployment, adding pressure to the verification window.