Ethereum’s Sepolia testnet activates Glamsterdam with optional 200 million gas limit

Ethereum’s Sepolia testnet activated the Glamsterdam upgrade on October 6, 2026, at 13:53:36 UTC. The fork landed at epoch 353,024. It gives validators the option to raise the network’s gas limit to 200 million. That is a big jump from the previous ceiling of roughly 60 million. This is a testnet, the place where Ethereum rehearses before anything touches real money. What actually changed on Sepolia Glamsterdam combines two upgrade tracks into one package. The first is Amsterdam, which covers the execution layer. That is the part of Ethereum that processes transactions and runs smart contracts. The second is Gloas, which covers the consensus layer. That is the part where validators agree on which blocks are valid and in what order. The headline feature is enshrined proposer-builder separation, or ePBS, defined in EIP-7732. In Ethereum terms, the builder assembles a block full of transactions. The proposer is the validator who actually puts that block forward to the network. “Enshrined” means the split now lives inside the protocol itself rather than in add-on software running alongside it. The package also includes block-level access lists and a round of gas repricings. Access list...