November 3, 2025
PHP versions 8.3.27 and 8.4.14, are now available on the platform. These updates bring the latest bug fixes, improving performance and security for your sites. The latest versions have already rolled out to all sites.
PHP 8.4 is only available with the new PHP Runtime Generation 2.
The PHP 8.4 upgrade process automatically includes an upgrade to PHP Runtime Generation 2 if your site hasn't been upgraded already.
Important PHP version information
- PHP 8.1 and 8.2 are currently receiving security-only updates.
- For more details, see the full list of PHP supported versions.
For the best performance and security, Pantheon recommends running PHP 8.2 and above.