Polygon Labs Issues Urgent Client Upgrade After Hard Forks

The mandatory nature of this upgrade signals that the hard forks introduced or exposed vulnerabilities serious enough to require immediate action from all network participants. This affects validators, node operators, and infrastructure providers who must coordinate the update to avoid chain splits or security lapses. The key watch point is whether the upgrade fully resolves the critical issues without introducing new ones, and how the network's operational stability holds during the transition period.