> ## 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 - June 2026

##### Version Number : 2.3.49

# Overview

This minor update introduces changes for Authlete 2.3.
This new version is available from June 25th (Thu).

# New Features & Improvements

## Rate limit improvements

Added a default `Retry-After` header to all 429 and 5xx error responses, with a default value of 1 second.

## Refresh token endpoint improvements

Improved refresh token endpoint to conditionally enable serialized read and return early when DB lock errors arise.

# Specs support

N/A

# Bug fixes

N/A

# Other

N/A