Heimdall v0.12.1 is the public counterpart of the private v0.12.1-priv release that delivered the Lugano hardfork, already activated on both networks:
- Amoy: block
47,105,000(2026-09-23) - Mainnet: block
54,627,000(2026-10-01 16:22 UTC)
Node operators still on v0.11.0 or older stop at the Lugano height. Upgrade to v0.12.1 and restart.
The release contains consensus-layer security fixes gated at the Lugano height (checkpoint window bounds, block-sync serving resource limits, bor/clerk/milestone validation hardening), plus the matching dependency bumps:
- cometbft
v0.3.9-polygon - cosmos-sdk
v0.2.15-polygon
What's Changed
Full Changelog: v0.11.0...v0.12.1