Picard 2.7.3 fixes a packaging regression for macOS, which caused the app to be reported as damaged when trying to launch it. This affected especially users of macOS 10.13, see PICARD-2395 for details.
There are no other changes in this release. If you are running Picard on a different operating system or if you are using macOS but could start Picard without an error message than you don’t need to upgrade.
The latest release is available for download on the Picard download page.