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Release of Canton 3.5.9

Canton 3.5.9 has been released on July 16, 2026.

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Summary

This is a maintenance release that brings few minor improvements.

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What’s New

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Minor Improvements

  • Improved and relaxed DB locking-scheme to avoid colliding with pg_dump execution. Also introduced better visibility for lock contention by emitting INDEX_DB_LOCK_TIMEOUT_ERROR in ERROR logs.
  • Switch from TRUNCATE queries to VACUUM + opportunistic REINDEX DB queries. This approach is using lower level DB locks less likely to collide with external processes.
  • Increase default network timeout for Indexer Database calls from 20 seconds to 40 seconds (canton.participants.<participant_name>.parameters.ledger-api-server-parameters.indexer.postgres-data-source.network-timeout) to provide more tolerance for indexing big transactions.
  • Report indexer as unhealthy after crash until at least one uncommitted update from before crash was processed or there are no uncommitted updates from before the crash. This puts a participant in unhealthy status if indexer enters crash loop due to problematic update in the queue.
  • An internal change is introduced which grants ReadAsAnyParty permissions to the traffic enforcement service. This removes the need to use non-standard config options to run local traffic enforcement with auth enabled:
  • The participant admin party is now exempt from the traffic enforcement balance check during submission.

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Compatibility

The following Canton protocol versions are supported: Canton has been tested against the following versions of its dependencies: