# Accessibility Checker upgraded to 3.5.2

> Canonical HTML version: https://rocketvalidator.com/blog/axe-core-upgraded-to-3-5-2
> 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 the latest version of Axe released by Deque, 3.5.2

<p>The Accessibility validation server on Rocket Validator has been upgraded to the latest version of Axe released by Deque, <a rel="nofollow" href="https://github.com/dequelabs/axe-core/blob/develop/CHANGELOG.md#352-2020-03-06">Axe Core 3.5.2</a> which fixes some bugs:</p>
 
- **meta-viewport:** parse negative and string values for `maximum-scale`
- **respondable:** ignore reflected messages from iframes 
- **header-present:** update verbiage to use heading instead of header
- **color-contrast:** mark more punctuations for review 
- **unicode:** detect supplementary private use area
- **definition-list:** Mention `<div>` is allowed to group content in `<dl>`
- **td-headers-attr:** mark as needs review if headers attr is empty
- **td-has-headers:** don't fail for empty headers attribute
- **th-has-data-cells:** fail when data cell points to a different header
- **has-lang:** update message to indicate that xml:lang is not valid on HTML pages
- **page-no-duplicate-contentinfo:** do not fail when first element is inside landmark

## 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">Accessibility rules checked by Rocket Validator</a>.

## Time to re-check your sites!

<p>As usual, it's recommended to re-check your sites after the validation servers have been upgraded, to get the most up-to-date results. Remember that you can <a href="https://docs.rocketvalidator.com/scheduling/">schedule</a> your reports to run periodically, so you don't have to do that manually every time.</p>