This is a pre-release for the Coston2 network only. It updates the Flare and Songbird codebase to AvalancheGo v1.15.1 (Helicon upgrade). The node refuses to start on the Flare and Songbird networks (mainnet is not supported); the activation times for the Coston, Songbird and Flare networks will be scheduled in the final release.
The changes go into effect
- November 3, 2026 at 12 PM UTC for the Coston2 network.
Coston2 nodes should be updated to this version before this time.
Your C-chain config.json may need changes to remain valid after the activation. Please read the notes before upgrading.