Symfony 7.1

Symfony 7.1 extended Symfony 7.0 with, among other changes, the TypeInfo component for representing and resolving PHP type information, and the #[MapUploadedFile] controller argument attribute for mapping uploaded files and applying validation constraints. It also continued the normal minor-release process of adding APIs, refining component behavior, and introducing deprecations that prepare applications for later Symfony versions.

Symfony 7.1 has reached end of life. Applications that remain on it no longer receive upstream security fixes or bug fixes for this line, so defects must be mitigated locally or accepted as operational risk. Over time, newer PHP versions, Symfony packages, and third-party bundles may require a newer Symfony release, making dependency updates harder and increasing the chance that an eventual upgrade becomes a larger compatibility project.

Select a currently supported Symfony target that is compatible with the application's PHP version and bundle ecosystem. Inventory all Symfony packages, bundles, custom extensions, and direct uses of deprecated APIs; then review the upgrade notes and deprecation messages for each intervening minor version. Update dependencies with Composer in a test environment, resolve deprecations and compatibility failures, and run unit, integration, functional, and deployment tests before promoting the upgrade. Keep the application on a supported Symfony line afterward and include regular dependency updates in normal maintenance work.