Prometheus v3.13.1 released on 10-07-2026
Prometheus v3.13.1 is out now. It is a bugfix patch for the 3.13 LTS line that corrects a TSDB head-chunk cache issue which could return samples from the wrong chunk or produce spurious “not found” errors for range queries after head-chunk truncation.
Check the release entry on GitHub for full details and links to the tracked fix: https://api.github.com/repos/prometheus/prometheus/releases/latest
What’s in this release
- TSDB: Fix the head-chunk cache returning samples from the wrong chunk, or spurious not-found errors, to range queries after head-chunk truncation. #19134
- A bugfix patch for the 3.13 LTS line aimed at restoring correctness for TSDB range queries.
- Relevant to deployments that perform head-chunk truncation (for example frequent chunk rollovers, compaction or retention events), where incorrect range query results may have been observed.
Upgrade notes
- No breaking changes have been reported; users on 3.13 LTS should plan a patch upgrade to v3.13.1 and review the fix in the linked release/PR.
- Test the upgrade in staging if you have heavy write or rollover patterns. If you must revert, restore your previous 3.13.x deployment while investigating and consult the release and PR #19134 for follow-up notes.
Share any comments on your upgrade experience or whether you observed incorrect range-query results after head-chunk truncation.
