According to @PANewsCN, Sonic issued an urgent notice requiring all mainnet and testnet nodes to upgrade to v2.1.2 immediately to avoid disconnections, replacing v2.1 ahead of a full Pectra-compatibility rollout. source: PANewsCN on X, Oct 23, 2025, https://twitter.com/PANewsCN/status/1981235271330124263; Sonic Labs on X, Oct 23, 2025, https://x.com/SonicLabs/status/1981103007443145066. The mandate covers validators, RPC providers, archive nodes, exchanges, and other node operators, and the release adds native fee subsidies and critical security improvements relevant to uptime and operational risk. source: Sonic Labs on X, Oct 23, 2025, https://x.com/SonicLabs/status/1981103007443145066. Upgraded nodes will remain on the current mainnet until a complete transition scheduled for Nov 3, 2025, giving traders and infrastructure teams a clear operational deadline to mitigate disconnection risk. source: Sonic Labs on X, Oct 23, 2025, https://x.com/SonicLabs/status/1981103007443145066.