Summary

This issue tracks all work required to support Symfony 8.0 in Sylius. Symfony 8.0 was released on November 27, 2025, and requires PHP >=8.4.

References:

• UPGRADE-8.0.md
• Preparing for Symfony 7.4 and 8.0
• Symfony 8.0.0 released

Blocking Sylius packages

• sylius/fixtures-bundle — supports Symfony 8
• sylius/mailer-bundle — supports symfony 8
• sylius/theme-bundle — supports symfony 8
• sylius/twig-extra — already supports ^8.0
• sylius/twig-hooks — already supports ^8.0
• sylius/resource-bundle — 1.14 already supports ^8.0

Blocking third-party dependencies

Runtime

• knplabs/knp-gaufrette-bundle — constrains symfony/config to ^5.0|^6.0|^7.0
• payum/payum-bundle — constrains symfony/framework-bundle to ^4.4||^5.4||^6.0||^7.0
• symfonycasts/dynamic-forms — main already supports ^8.0
• doctrine/doctrine-bundle — v3.2.2 supports ^8.0 (requires bumping Sylius constraint from ^2.13 to ^3.2)

Dev

• friends-of-behat/mink — constrains symfony/css-selector to ^4.4|^5.0|^6.0|^7.0
• friends-of-behat/symfony-extension — constrains symfony/dependency-injection to
  ^6.4||^7.0
• friends-of-behat/variadic-extension — constrains symfony/dependency-injection to
  ^5.4||^6.4||^7.0
• behat/behat — constrains symfony to ^5.4||^6.4||^7.0 - Symfony 8 support issue and Modernize Behat configuration #18822
• phparkitect/phparkitect— v0.8.0 supports ^8.0 (requires bumping Sylius constraint from ^0.6 to ^0.8)

Packages to remove

• symfony/proxy-manager-bridge — does not exist in Symfony 8 (max 6.4), replaced by native lazy proxies in PHP 8.4+
• friendsofphp/proxy-manager-lts — related to the above

Doctrine DBAL upgrade

• Symfony 8.0's doctrine-messenger requires doctrine/dbal ^4.3, Sylius currently requires ^3.9
• doctrine/doctrine-bundle 3.x also requires doctrine/dbal ^4.0
• DBAL 3.x → 4.x has its own breaking changes — likely a separate effort

XML configuration migration

Symfony 7.4 deprecates XmlFileLoader for service definitions and routing. It is removed in 8.0. The following XML files loaded via Symfony's XmlFileLoader need to be migrated to PHP or YAML:

• service definition XML files (Resources/config/services/*.xml, Resources/config/*.xml)
• All Extension classes using XmlFileLoader need to switch to PhpFileLoader or YamlFileLoader

Summarized in separated issue #18490 by @loic425 🎉