Ethereum is getting its next major upgrade, and for the first time it has a date: on October 6, 2026, Glamsterdam is due to be activated on the Sepolia test network. If you stake yourself, that is the point from which your node needs a software version that does not exist today as a stable release. On September 11, 2026 we counted the published version levels of all ten major Ethereum clients to show how far preparation has actually come.