Odaily News Optimism published a post on the X platform stating that it has successfully activated the Isthmus hard fork, introducing key features from the Ethereum Pectra upgrade to the OP Stack and Superchain. This upgrade was only two days after Pectra went live on the Ethereum mainnet, and Superchain is the first L2 ecosystem to support the Pectra upgrade. This upgrade covers Base, Ink, OP Mainnet, Soneium, Unichain, and several other OP Stack chains.