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
Support for Symfony 2.0 ended in September 2013. You should upgrade to 3.2 version.
Jul 2011 Release
Mar 2013 End of support for bug fixes
Sep 2013 End of support for security fixes