# MinIO RELEASE.2020-12-12T08-39-07Z — Release & Upgrade Intelligence
- **Product:** MinIO (https://min.io)
- **Version:** RELEASE.2020-12-12T08-39-07Z
- **Released:** Dec 12, 2020
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/minio/updates/RELEASE.2020-12-12T08-39-07Z/

## Executive Summary (TL;DR)
MinIO RELEASE.2020-12-12T08-39-07Z. Source highlight: No rolling upgrade supported in this release, please upgrade all servers at once.

## Improvements
- Important list caching improvements in #11087 #11078

## Bug Fixes
- fix: a crash when disk is nil, safe access on erasureDisks (#11089) (12/11/20) (Harshavardhana)
- fix: TTFB prometheus metrics calculation (#11082) (12/10/20) (Harshavardhana)
- docs: fix the metrics formatting (#11081) (12/10/20) (Harshavardhana)
- fix: refactor locks to apply them uniquely per node (#11052) (12/10/20) (Harshavardhana)
- fix: grafana double counting for bucket usage, histrogram and objects (#11070) (12/09/20) (Harshavardhana)