## Improvements

### HAProxy Upgrade

The embedded HAProxy server used to direct traffic in Chef Infra Server was upgraded from 1.6 to 1.8. This new version includes significant multithreading performance improvements to increase the scalability of Chef Infra Server.

## Security Updates

### PostgreSQL

PostgreSQL was upgraded from 9.6.21 to 9.6.22 to resolve [CVE-2021-22137](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32027) and [CVE-2021-22137](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32028).

### Elasticsearch

Elasticsearch was upgraded from 6.8.14 to 6.8.15 to resolve [CVE-2021-22137](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22137).