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
long term support version
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
May 2015 Release
May 2018 End of support for bug fixes
May 2019 End of support for security fixes