This release updates the Flare and Songbird codebase to AvalancheGo v1.15.1 (Helicon upgrade).
The changes go into effect
- November 3, 2026 at 12:00:00 UTC for the Coston2 network (already active, as scheduled by the v1.15.1-coston2 pre-release),
- November 11, 2026 at 7:00:00 UTC for the Coston network,
- November 11, 2026 at 8:00:00 UTC for the Songbird network,
- November 11, 2026 at 14:00:00 UTC for the Flare network.
Nodes should be updated to this version before these times.
Your C-chain config.json may need changes to remain valid after the activation. Please read the notes before upgrading.