Upgrading to v16

If you are migrating from WordPress to Altis, check out the migrating guide first.

To upgrade to Altis v16, edit your composer.json and change the version constraint for altis/altis and any local environment modules to ^16.0.0.

	"require": {
		"altis/altis": "^16.0.0"
	"require-dev": {
		"altis/local-server": "^16.0.0"
	"config": {
		"platform": {
			"php": "8.0"

Once you have made these changes run composer update and then run the wp altis migrate command:

# For cloud environments
wp altis migrate

# For local server
composer server cli -- altis migrate

Breaking Changes

PHP 8.2

Altis v16 continues our experimental support for PHP 8.2 in both local and cloud environments. We have improved compatability with PHP 8.2 (and 8.1) but there are a number of backward incompatible changes in PHP 8.2 which you should take into consideration.

Refer to our PHP Version Guide for up-to-date compatibility, testing and upgrading information.

Headline Features


Altis v16 comes with Afterburner support which is a drop-in implementation of the WP Object Cache API and WordPress' translation API as a PHP Extension backed by Redis.

We created our own PHP extension just to optimise WordPress performance. We’ve taken the slowest, most-used parts of WordPress, and reimplemented them to squeeze every drop of performance out of your site.

To activate Afterburner on your environment, create a support ticket with the request.

Altis Core improvements

We made over twenty-five updates to modules and libraries in Altis to bring in important bug fixes and improvements. This includes the WordPress CMS, which we updated to version 6.2.2.


Our developer focussed documentation has been improved again. As usual, feedback from our customers and partners is always welcome. Please send us any feedback you have.