Protocol 24 is a stability upgrade for Stellar that fixes a bug in the state archival feature. The upgrade was completed on mainnet on October 22, 2025, with infrastructure operators and validators required to update their software.
Protocol 24 is a critical stability upgrade for the Stellar network designed to address a bug in the state archival feature. The upgrade followed a compressed timeline with stable releases available October 20, testnet upgrade on October 21, and mainnet upgrade vote completed on October 22, 2025 at 1700 UTC. Infrastructure operators running Stellar Core, Horizon, RPC, or Galexie needed to install Protocol 24 releases, while validators were required to arm their nodes with the upgrade command. SDK users required no action as there were no XDR changes. The guide provides detailed instructions for different stakeholder groups and links to all relevant release repositories.
