The GNOME Shell user interface and the Mutter compositing manager have completely transitioned to using the GTK4 library, removing the strong dependency on GTK3. Additionally, the gnome-desktop-3.0 dependency has been replaced with gnome-desktop-4 and gnome-bg-4, while libnma has been updated to libnma4.
Overall, GNOME still remains tied to GTK3, as not all applications and libraries have been ported to GTK4 yet. For instance, WebKit, libpeas, libibus, the document viewer Evince, the video player Totem, the image viewer Eog, Boxes, Connections, Disks, Simple-scan, Photos, and System Monitor are still dependent on GTK3.
Source: opennet.ru
