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 version2.8.20
for projects that prioritize very long support over new features
recommended to create new Symfony projects
for testing projects with the upcoming Symfony version
Check out the full Symfony version history to know which versions are still supported.
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Symfony version checker
Symfony 3.3 will be a stable version published in May 2017.
May 2017 Release
Jan 2018 End of support for bug fixes
Jul 2018 End of support for security fixes