> ## 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.

# 3.6.2

> Canton 3.6.2 release notes.

# Release of Canton 3.6.2

Canton 3.6.2 has been released on October 15, 2026.

## Summary

This patch release fixes a slow Ledger API query that could stall the initialization of the ACS commitment processor
in Canton 3.6.1 by using index lookups.

## What’s New

### Event sequential id range lookup of Ledger API update streams with index scans

#### Background

Canton 3.6.1 contains a slow database query that can cause SQL timeouts and stall the long-running initialization
of the new ACS commitment processor. SVs and high-volume validators are the most likely to be affected.

The slowdown came from how the Ledger API server mapped a requested offset range to the corresponding range of event
sequential ids. The query aggregated over every `lapi_update_meta` row in the offset range, so its cost grew with
the size of that range.

#### Specific Changes

* The event sequential id range is now resolved with two index lookups on `lapi_update_meta`, so the cost no longer
  depends on the size of the offset range.

#### Impact and Migration

Starting an update stream over a large offset range is now cheaper. As a result, the ACS commitment processor
initializes faster and is less likely to hit SQL timeouts. Ledger API results are unchanged, and no migration
is required.

## Compatibility

The following Canton protocol versions are supported:

| Dependency | Version |
| - | - |
| Canton protocol versions | 34, 35, 36 |

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 17.11 (Debian 17.11-1.pgdg13+2) – Also tested: PostgreSQL 14.24 (Debian 14.24-1.pgdg13+2), PostgreSQL 15.19 (Debian 15.19-1.pgdg13+2), PostgreSQL 16.15 (Debian 16.15-1.pgdg13+2), PostgreSQL 18.6 (Debian 18.6-1.pgdg13+2) |