According to Foresight News, OP Labs protocol engineer Mofi released an upgrade proposal "Granite Network Upgrade" in the Optimism community, which aims to address the security vulnerabilities found by Spearbit, Cantina and Code4rena in a series of third-party security audits. The relevant vulnerabilities have not been exploited and user assets have never been threatened. Out of caution, a license fallback mechanism has been activated to avoid any potential instability during the patching of the vulnerability. If the proposal is voted through, the Granite Network Upgrade is scheduled to be carried out at 00:00 on September 11. The upgrade has been coordinated with Base and Conduit to be launched on the internal development network and Sepolia Superchain.