# Accessibility Checker upgraded to Axe Core 4.9

> Canonical HTML version: https://rocketvalidator.com/blog/accessibility-checker-upgraded-to-axe-core-4.9
> Attribution: Rocket Validator (https://rocketvalidator.com)
> License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

The Accessibility validation server on Rocket Validator has been upgraded to Axe Core 4.9, which improves color contrast checks and fixes some bugs from previous versions.

<p>We've upgraded our Accessibility validation servers to the latest version of <a rel="nofollow" href="https://github.com/dequelabs/axe-core">axe-core</a>, 4.9, which improves color contrast checks and fixes some bugs from previous versions.</p>

As usual, you don't need to do anything on your side to update, we've upgraded our servers with this version so they'll run automatically in your next reports.

## Full Changelog

Check out the [4.9.0 release notes](https://github.com/dequelabs/axe-core/releases/tag/v4.9.0).

Check out the [4.9.1 release notes](https://github.com/dequelabs/axe-core/releases/tag/v4.9.1).

## Current accessibility ruleset

Check out the full list of accessibility rules that are being checked currently by our web crawler

<a href="https://rocketvalidator.com/accessibility-validation/axe">Accessibility rules checked by Rocket Validator</a>.