Qt 6.4 End of Life
Support dates and upgrade guidance — rebuilt from live data.
End of Life
Qt 6.4 reached end of life on 31 Mar 2023. It no longer receives security fixes.
1,227 days without security patches
Recommended action: upgrade to Qt 6.11. Check your versionqmake --version
Support timeline
Official dates from the Qt release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 28 Sept 2022 | — |
| End of life | 31 Mar 2023 | 3.4 years ago |
| Extended support ends | 28 Sept 2023 | over |
| Latest release | 6.4.3 · 16 Mar 2023 | final |
Where to go from 6.4
Recommended target: Qt 6.11 (supported until 22 Sept 2026).
The newest actively supported branch is Qt 6.11 (latest release 6.11.1).
Frequently asked questions
Is Qt 6.4 still safe to use?
Qt 6.4 reached end of life on 31 Mar 2023, 1,227 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Qt 6.4?
Yes — the final release (6.4.3) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Qt 6.4 to?
Upgrade to Qt 6.11, the newest actively supported branch (supported until 22 Sept 2026).