Symfony 4 was released on November 30th.
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Symfony Roadmap

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

3.4.1
for projects that prioritize very long support over new features

current

4.0.1
recommended to create new Symfony projects

development

for testing projects with the upcoming Symfony version

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Symfony version checker

Symfony 3.4 is a long term support version with 3 years support that was published in November 2017.

Roadmap

Nov 2017 Release

Nov 2020 End of support for bug fixes

Nov 2021 End of support for security fixes

TIP Get this information in JSON format: http://symfony.com/roadmap.json?version=3.4