diff --git a/documentation/src/bundled-libs.dox b/documentation/src/bundled-libs.dox
index 4ea3276bc..90d0fb0d3 100644
--- a/documentation/src/bundled-libs.dox
+++ b/documentation/src/bundled-libs.dox
@@ -23,14 +23,14 @@ The nanosvg library is not affected.
 
 \section bundled-status Current status
 \code
-Current versions of bundled libraries (as of September 13, 2023):
+Current versions of bundled libraries (as of October 29, 2023):
   Library       Version/git commit Release date         FLTK Version
   --------------------------------------------------------------------------
   jpeg          jpeg-9e            2022-01-16           1.4.0
   nanosvg       abcd277ea4 [1]     2022-12-22           1.4.0
   png           libpng-1.6.40      2023-06-21           1.4.0
   zlib          zlib-1.3           2023-08-18           1.4.0
-  libdecor      422abaf9   [2]     2023-09-07           1.4.0
+  libdecor      c6c780c1   [2]     2023-10-10           1.4.0
   --------------------------------------------------------------------------
 
 Previous versions of bundled libraries (FLTK 1.3.x):
diff --git a/documentation/src/wayland.dox b/documentation/src/wayland.dox
index 84b93f0e7..170ab10c7 100644
--- a/documentation/src/wayland.dox
+++ b/documentation/src/wayland.dox
@@ -59,13 +59,13 @@ Wayland differs also from X11 in that the position of a window in the display is
 completely hidden to the client app. This prevents function \c Fl_Window::position() from having
 any effect on a top-level window. Wayland also prevents a client app from knowing whether
 a window is minimized: \c Fl_Window::show() has no effect on a minimized window.
-Subwindows can be positioned as usual relatively to their
-parent window. FLTK uses that for the small, yellow windows that display
-the new scale factor value when it's changed: these are created as short-lived subwindows
-centered above \c Fl::first_window().
+Subwindows can be positioned as usual relatively to their parent window.
 Wayland allows to create popup windows positioned relatively to a previously mapped other
-window. This allows FLTK to position adequately menu and tooltip windows, see
-\ref menu-windows.
+window. This allows FLTK to position adequately menu and tooltip windows
+(see \ref menu-windows).
+FLTK uses also popups for the small, yellow windows that display
+the new scale factor value when it's changed: these are created as short-lived popups
+centered above \c Fl::first_window().
 
 Wayland uses a trick of its own to handle lists of linked records. It defines type
 <tt>struct wl_list</tt> and a few macros (\c wl_list_init(), \c wl_list_for_each(), \c wl_list_insert(),
diff --git a/libdecor/src/plugins/gtk/libdecor-gtk.c b/libdecor/src/plugins/gtk/libdecor-gtk.c
index bc8290f14..c510bc595 100644
--- a/libdecor/src/plugins/gtk/libdecor-gtk.c
+++ b/libdecor/src/plugins/gtk/libdecor-gtk.c
@@ -2548,15 +2548,12 @@ init_wl_seat(struct libdecor_plugin_gtk *plugin_gtk,
 	struct seat *seat;
 
 	if (version < 3) {
-		char *err_msg;
-		asprintf(&err_msg,
-			 "%s version 3 required but only version %i is available\n",
-			 wl_seat_interface.name, version);
 		libdecor_notify_plugin_error(
 				plugin_gtk->context,
 				LIBDECOR_ERROR_COMPOSITOR_INCOMPATIBLE,
-				err_msg);
-		free(err_msg);
+				"%s version 3 required but only version %i is available\n",
+				wl_seat_interface.name,
+				version);
 	}
 
 	seat = zalloc(sizeof *seat);
@@ -2640,15 +2637,12 @@ init_wl_output(struct libdecor_plugin_gtk *plugin_gtk,
 	struct output *output;
 
 	if (version < 2) {
-		char *err_msg;
-		asprintf(&err_msg,
-			 "%s version 2 required but only version %i is available\n",
-			 wl_output_interface.name, version);
 		libdecor_notify_plugin_error(
 				plugin_gtk->context,
 				LIBDECOR_ERROR_COMPOSITOR_INCOMPATIBLE,
-				err_msg);
-		free(err_msg);
+				"%s version 2 required but only version %i is available\n",
+				wl_output_interface.name,
+				version);
 	}
 
 	output = zalloc(sizeof *output);
@@ -2814,6 +2808,8 @@ libdecor_plugin_new(struct libdecor *context)
 
 	/* setup GTK context */
 	gdk_set_allowed_backends("wayland");
+	gtk_disable_setlocale();
+
 	if (!gtk_init_check(NULL, NULL)) {
 		libdecor_notify_plugin_error(
 				plugin_gtk->context,