Symfony manages its releases through a time-based model. A new Symfony minor version comes out every six months, one in May and one in November. Check out the release process details.
Latest Symfony versions
Maintained Symfony branches
These are the Symfony branches currently supported for bug fixes. Check out the Symfony release process for the full details.
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Symfony 4.1 roadmap
May 2018 Release
Jan 2019 End of support for bug fixes
Jul 2019 End of support for security fixes