End of life / Symfony / 4.0
End of life
Symfony 4.0 is past end of life.
Security fixes stopped on 1 Jan 2019, 2858 days ago. New vulnerabilities in 4.0 won’t be fixed.
- Released
- 30 Nov 2017
- Active support
- ended 1 Jul 2018
- Security fixes
- ended 1 Jan 2019
- Latest
- 4.0.15
Upgrade to Symfony 7.4: security fixes until 30 Nov 2029.
Release cycles
Every Symfony cycle, at a glance.
Active support means bug fixes and security fixes; after it, security fixes only. Past the end of security support, nothing.
- Active support
- Security fixes only
- Supported
- Ends within 90 days
- Ended
Cycle
Status
Released
Active until
Security until
Latest
What to upgrade to
Go to 7.4.
7.4 is the newest supported long-term Symfony cycle, with security fixes until 30 Nov 2029.
Before you upgrade
Fix every deprecation the last minor of your major reports before moving to the next major. Each major’s .4 release is long-term: three years of bug fixes and four of security fixes; other minors get eight months. Read the Symfony 7.4 upgrade guide
How to check your version
Which Symfony is this site on?
In the app
In the lock file
Know before support ends.
Porro reads the PHP, framework and database version from every site and tells you 90 days before support runs out.
Dates from endoflife.date/symfony, checked daily · data as of 29 Oct 2026.