> ## Documentation Index
> Fetch the complete documentation index at: https://docs.canton.network/llms.txt
> Use this file to discover all available pages before exploring further.

# 3.5.9

> Canton 3.5.9 release notes.

# Release of Canton 3.5.9

Canton 3.5.9 has been released on July 16, 2026.

## Summary

This is a maintenance release that brings few minor improvements.

## What’s New

### 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:
  ```
  canton.participants.<participant_name>.ledger-api.admin-token-config.act-as-any-party-claim=true
  canton.participants.parameters.non-standard-config=true
  ```
* The participant admin party is now exempt from the traffic enforcement balance check during submission.

## 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) |