This is release 4.9.1 of the Authoritative Server. It contains a collection of small fixes. A detailed list of changes can be found in the changelog.
Please make sure to read the Upgrade Notes before upgrading.
If you install (not upgrade to) this version on Debian or Ubuntu, please read this ticket about broken configs first.
The tarball (signature) is available at downloads.powerdns.com. Packages for various distributions are available from repo.powerdns.com.
Please send us all feedback and issues you might have via the mailing list, or in case of a bug, via GitHub.
Note that per our End of life policy, the release of version 4.9 marked the end of support for version 4.6.