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
Check out the full Symfony version history to know which versions are still supported.
long term support version
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Symfony version checker
May 2017 Release
Jan 2018 End of support for bug fixes
Jul 2018 End of support for security fixes