Symfony 6.4 end of life
Bug fixes end in November 2026. Security fixes end in November 2027. Symfony 6.4 is the last 6.x release and needs PHP 8.1 or higher.
| Branch | Bug fixes until | Security fixes until | Minimum PHP |
|---|---|---|---|
| 5.4 LTS | 2024-11 | 2029-02 | 7.2.5 |
| 6.4 LTS | 2026-11 | 2027-11 | 8.1.0 |
| 7.4 LTS | 2028-11 | 2029-11 | 8.2.0 |
| 8.1 | 2027-01 | 2027-01 | 8.4.0 |
What actually stops
After November 2026 no bug fixes land in the 6.4 branch. Anything that breaks because of a newer PHP release, a newer dependency or a Doctrine change stays broken unless you patch it yourself. Security fixes continue for one more year, until November 2027. After that, a vulnerability in the framework is your problem.
Third-party bundles move faster than the framework. Many drop 6.4 in their next major as soon as bug fixes stop, so the real deadline is usually the moment your first important bundle requires Symfony 7.
What keeps working
Your application does not stop running on the date. Composer keeps installing 6.4. The risk is gradual: PHP 8.4 and 8.5 deprecations that nobody fixes, bundles you cannot update, and a growing gap to 7.4 that makes the eventual upgrade bigger.
The path from 6.4
- Deprecations to zero on 6.4. Run the test suite with the PHPUnit bridge and fix every deprecation. This is where most of the 7.0 work is, and it is deployable on 6.4.
- Doctrine ORM 3 and attributes if you are still on ORM 2 or annotations. Both are independent of the Symfony version and ship as their own PR.
- API Platform 3 → 4 if you use it; 4.x requires Symfony 6.4 or newer, so this can happen before or after the framework step.
- Symfony 6.4 → 7.4 in one composer update once deprecations are gone. Then PHP 8.3 or 8.4.
A clean 6.4 codebase with attributes and ORM 3 typically lands between €3,500 and €6,000 as a fixed-price project. Details on services and prices.
Where does your application stand?
Upload your composer.lock and get your upgrade path, the packages that block it, and a readiness score in seconds. Free, no account, no source code.
Dates verified 2026-09-09 against the official release pages. Other deadlines: Symfony 5.4 end of life · PHP 8.2 end of life · Doctrine ORM 2 end of life · all end-of-life dates. Also available in Deutsch Nederlands