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 version2.8.11
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 3.1 is the latest stable version and it will be maintained until the end of July 2017.
May 2016 Release
Jan 2017 End of support for bug fixes
Jul 2017 End of support for security fixes