You are browsing the Symfony 4 documentation, which changes significantly from Symfony 3.x. If your app doesn't use Symfony 4 yet, browse the Symfony 3.4 documentation.

Upgrading a Patch Version (e.g. 4.1.0 to 4.1.1)

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Upgrading a Patch Version (e.g. 4.1.0 to 4.1.1)

When a new patch version is released (only the last number changed), it is a release that only contains bug fixes. This means that upgrading to a new patch version is really easy.

To upgrade to a new "patch" release, read the Upgrading a Minor Version article. Thanks to Symfony's backwards compatibility promise, it's always safe to upgrade to the latest "minor" version.


It is recommended to update to a new patch version as soon as possible, as important bugs and security vulnerabilities may be fixed in these new releases.

Upgrading other Packages

You may also want to upgrade the rest of your libraries. If you've done a good job with your version constraints in composer.json, you can do this safely by running:

$ composer update


Beware, if you have some unspecific version constraints in your composer.json (e.g. dev-master), this could upgrade some non-Symfony libraries to new versions that contain backwards-compatibility breaking changes.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.