Internet Systems Consortium has released ISC DHCP 4.2.0, containing many new features as well as a number of bug fixes.

This feature release contains asynchronous DDNS processing that enables the DHCP server
to continue processing DHCP packets while DDNS updates are pending. To read the complete release notes, click here

This release, and its OpenPGP-signatures are available at:
ftp://ftp.isc.org/isc/dhcp/dhcp-4.2.0.tar.gz
ftp://ftp.isc.org/isc/dhcp/dhcp-4.2.0.tar.gz.sha512.asc
ftp://ftp.isc.org/isc/dhcp/dhcp-4.2.0.tar.gz.sha256.asc
ftp://ftp.isc.org/isc/dhcp/dhcp-4.2.0.tar.gz.sha1.asc