Apache Solr 4 End of Life
Support dates and upgrade guidance — rebuilt from live data.
Apache Solr 4 is past end of life. The vendor has not published a dated end-of-support announcement for this branch; newer branches have documented dates that are already past.
Recommended action: upgrade to Apache Solr 10.Support timeline
Official dates from the Apache Solr release process.
| Milestone | Date | Status |
|---|---|---|
| Initial release | 11 Oct 2012 | — |
| End of life | — | years ago |
| Latest release | 4.10.4 · 3 Mar 2015 | final |
Where to go from 4
Recommended target: Apache Solr 10.
The newest actively supported branch is Apache Solr 10 (latest release 10.0.0).
Frequently asked questions
Is Apache Solr 4 still safe to use?
Apache Solr 4 reached end of life on —, 0 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.
Can I still download Apache Solr 4?
Yes — the final release (4.10.4) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.
What should I upgrade Apache Solr 4 to?
Upgrade to Apache Solr 10, the newest actively supported branch.