Sonic has announced that all mainnet and testnet nodes must upgrade to version 2.1.2 immediately to prevent disconnection. This update, shared on the X platform, introduces native fee subsidies and crucial security enhancements. It supersedes the previous v2.1 version as part of the transition to Pectra compatibility. The upgrade is mandatory for validators, RPC providers, archive nodes, exchanges, and other node operators. Post-upgrade, nodes will continue to function on the current mainnet until the complete transition on November 3, 2025.