Ethereum's Glamsterdam test received a last-minute fix on Oct 6, with one of the network's main validator clients releasing an update just before the Sepolia test gets underway.
The test is designed to raise the amount of computational work each block can hold to 200 million gas, a major capacity jump from current levels. Validator clients process and validate blocks on Ethereum, so their software must be aligned with any change to block parameters.
Coverage of the event describes the update as a fix applied hours before the test, addressing one client's readiness for the higher gas limit. Glamsterdam follows the named-testnet pattern Ethereum has used previously to trial significant network changes before they reach the main network.