The GNOME Sushi file previewer, a component of the GNOME Files (Nautilus) file manager, has recently been updated to utilize GTK4. This adaptation introduces a series of enhancements aimed at improving the file previewing experience for GNOME users, including the addition of a dark mode. The move to GTK4 modernizes the backend of the file previewer, aligning it with current GNOME development standards and enabling better integration with the desktop environment's evolving UI toolkit. This update is expected to provide a more refined and consistent user interface.