https://w.scribus.net/wiki/index.php/1.5.8_Release
Excerpt:
The Scribus Team is pleased to announce the release of version 1.5.8.
Like previous releases, work on version 1.5.8 focused mostly on bugfixes and code optimizations, the latter of which are expected to lead to reliability and speed improvements. We have also begun to prepare Scribus for using Qt6, which will make our work easier for future releases.
Most important changes
General
UI Improvements for dark mode and some icon updates and window interactivity
Improvements to file import (IDML, PDF, PNG, TIFF, SVG)
Improvements to PDF export
Improvements with respect to tables (undo/redo, styles)
Improvements to the Story Editor
Improvements to the build system
Translation updates
Technical/OS-related updates
macOS:
Scribus 1.5.8 now includes Python 3 and is built for mac OS Catalina or higher.
Additional Notes
The complete changelog is available here: https://bugs.scribus.net/changelog_page.php?version_id=114. More details are available from the Scribus Commit Mailing List archive (http://lists.scribus.net/pipermail/scribus-commit/), beginning with revision 24637 in April 2021.
Please note that while some bug fixes still may be backported to the 1.4.x branch, we do not plan an official release of this version anymore. If you think you need the changes, you have to check out the SVN repository and build 1.4.9svn from source. We encourage all Linux and *BSD distributions to switch from 1.4.x to this new version, since it's not only much more versatile but also more stable.
A big »Thank You« to all developers of this wonderful and powerful software!