Release Notes: Combining of measurements from multiple sources was implemented, an option to generate command keys was added, an option to authenticate chronyc automatically was added, compatibility with NTPv1 and NTPv2 clients was improved, and other improvements and bugfixes were made.
Release Notes: Clock accuracy with NTP sources and reference clocks was improved. Source selection and polling interval adjustment were improved. Delayed server name resolving was added. Many other bug fixes and improvements were made.
Release Notes: Support for reference clocks (SHM, SOCK, PPS drivers), IPv6 support has been added, Linux capabilities support (to drop root privileges), memory locking support on Linux, real-time scheduler support on Linux, leap second support on Linux, and support for editline have been added. There are many bug fixes and improvements.