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 version checker
Nov 2017 Release
Nov 2020 End of support for bug fixes
Nov 2021 End of support for security fixes