# MinIO RELEASE.2019-12-17T23-16-33Z — Release & Upgrade Intelligence
- **Product:** MinIO (https://min.io)
- **Version:** RELEASE.2019-12-17T23-16-33Z
- **Released:** Dec 18, 2019
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/minio/updates/RELEASE.2019-12-17T23-16-33Z/

## Executive Summary (TL;DR)
MinIO RELEASE.2019-12-17T23-16-33Z. Source highlight: **Breaking Change** Lots of new features have been implemented, so rolling upgrade is not supported. Please upgrade all servers. Also, `mc` version `RELEASE.2019-12-17T23-26-28Z` is required to talk to this version of MinIO.

## Breaking Changes & Deprecations
- - **Breaking Change** Lots of new features have been implemented, so rolling upgrade is not supported. Please upgrade all servers. Also, `mc` version `RELEASE.2019-12-17T23-26-28Z` is required to talk to this version of MinIO.

## New Features
- **Breaking Change** Lots of new features have been implemented, so rolling upgrade is not supported. Please upgrade all servers. Also, `mc` version `RELEASE.2019-12-17T23-26-28Z` is required to talk to this version of MinIO.
- Add bucket expansion feature. See (#8509) for more details.
- Add data usage admin API. See (#8553) for more details.
- add minio/keys KMS integration (#8631) (12/13/19)
- Add encryption buffer (#8626) (12/12/19)
- Add bucket and object count along with total object size (#8639) (12/12/19)

## Improvements
- Improvements to S3 Select. See (#8464, #8456, #8457, #8608, #8610) for more details.
- Improvements to self healing. See (#8462, #8114) for more details.
- Improvements to ListenBucketNotification API
- Improvements to caching. See (#8599, #8619) for more details.
- Enhance ListObjectsV2 API to return UserDefined metadata (#8539) (11/21/19)
- Improve access and secret key validation error, sync with implementation (#8516) (11/14/19)

## Bug Fixes
- fix: populate buckets on etcd after config has loaded (#8658) (12/17/19)
- Fix crash in console logger and also handle bucket DNS updates (#8654) (12/16/19)
- Fix aws-sdk-php functional test cases for GCS gateway (#8613) (12/16/19)
- fix: Don't allow to set unconfigured notification ARNs (#8643) (12/13/19)
- fix: CacheOpts parsing tests (#8632) (12/11/19)
- Fix k8s replica set deployment (#8629) (12/10/19)