Ardor Rolls Out Mandatory v.2.5.3 Upgrade for Testnet Nodes on December 18

Name: Testnet Hardfork
Start: 2025-12-18T00:00:00Z
End: 2025-12-19T00:00:00Z

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Ardor introduces a mandatory update to v.2.5.3 for all testnet nodes, ahead of a scheduled testnet hard fork expected at block 20,200,200 on December 18. The update is part of the Ardor Beginners Series and includes performance improvements and protocol enhancements to ensure stable network development. Users are also offered video guidance and access to a detailed changelog.

Event date: December 18, 2025 UTC

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