Proof-of-Stake

Austin and Kyoto Have Already Activated — Polygon Labs Says Stale PoS Nodes Must Upgrade Immediately

Polygon Labs has issued an urgent advisory stating that nodes running outdated Polygon Proof-of-Stake (PoS) binaries for Bor or Heimdall have already been deactivated from the canonical chain. The hardforks, named Austin and Kyoto, activated on mainnet at specific block heights, requiring immediate upgrades to avoid further disconnection. Failure to upgrade means nodes must resync after updating to track the accepted network history.