Release of Canton 3.5.10

Canton 3.5.10 has been released on July 23, 2026.

Summary

This is a maintenance release that brings UX and hardening improvements.

What’s New

Minor Improvements

Fixed an edge case that could cause deserialization of proto durations to fail
Fixed an issue where topology transactions with max serial where not handled properly
Ledger JSON API /v2/state/active-contracts-page is now available via POST; the GET variant that expects a request body is deprecated.
Bump Flyway dependency to 12.0.2 to enable Postgres 18 support

Compatibility

The following Canton protocol versions are supported:

Dependency	Version
Canton protocol versions	34, 35

Canton has been tested against the following versions of its dependencies:

Dependency	Version
Java Runtime	OpenJDK 64-Bit Server VM (build 21.0.12+2-nixos, mixed mode, sharing)
Postgres	Recommended: PostgreSQL 17.10 (Debian 17.10-1.pgdg13+1) – Also tested: PostgreSQL 14.23 (Debian 14.23-1.pgdg13+1), PostgreSQL 15.18 (Debian 15.18-1.pgdg13+1), PostgreSQL 16.14 (Debian 16.14-1.pgdg13+1), PostgreSQL 18.4 (Debian 18.4-1.pgdg13+1)

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