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

# Authlete 2.3 Release Notes - September 2026

##### Version Number : 2.3.51

# Overview

This minor update introduces changes for Authlete 2.3.
This new version is available from October 1st (Thu).

# New Features & Improvements

## Get RAT endpoint

Implemented new endpoint to retrieve the Registration Access Token (RAT) hash for a specific dynamically registered client.

# Specs support

N/A

# Bug fixes

## Access Token endpoint fix

Fixed an issue where a failing call to the `access_token` endpoint could return a `500` error, instead of a handled error such as `400` or `404`.

# Other

N/A