Polygon Labs Issues Client Upgrade Notice After Austin and Kyoto Hardforks
Polygon requires Bor v2.10.0+ and Heimdall v0.11.0+ after the August hardforks to restore canonical consensus on PoS nodes.
Polygon Labs said any Polygon PoS node that stayed on pre-hardfork Bor or Heimdall binaries past two August activation heights has already fallen out of canonical consensus.
Stale nodes must upgrade and catch up before they can follow the network’s accepted history again. The company’s Aug. 27 security review described a client-compatibility consequence and reported no mainnet disruption from the hardforks.
Version Requirements
Bor versions earlier than v2.10.0 are incompatible after Austin activated at mainnet block 91,949,700. Heimdall validators and full nodes need v0.11.0 after Kyoto activated at height 51,533,000 on Aug. 18 at 10:10:31 UTC.
Fixes and Unknowns
Austin capped gas on state-sync events and removed the unbounded TxDependency field to prevent stalls and peer crashes. Kyoto added nesting checks, fee-coin caps, and other edge-case fixes for validator work and checkpoint issues.
The exact number of affected nodes or operators still on old binaries remains unknown, and any operational impact on specific RPC or validator setups has not been quantified.