New maintenance releases are available in the 9.11 and 9.12 branches of BIND. Release notes can be found with the releases or via these links: 9.11.5: https://ftp.isc.org/isc/bind9/9.11.5/RELEASE-NOTES-bind-9.11.5.html 9.12.3: https://ftp.isc.org/isc/bind9/9.12.3/RELEASE-NOTES-bind-9.12.3.html