diff --git a/configure.ac.in b/configure.ac.in
index a7b3fbc..078ff5e 100644
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -126,7 +126,7 @@ dnl ***********************************
 dnl *** Check for required packages ***
 dnl ***********************************
 XDT_CHECK_PACKAGE([GOBJECT], [gobject-2.0], [2.16.0])
-XDT_CHECK_PACKAGE([GTK], [gtk+-2.0], [2.14.0])
+XDT_CHECK_PACKAGE([GTK], [gtk+-2.0], [2.20.0])
 XDT_CHECK_PACKAGE([LIBXFCE4UTIL], [libxfce4util-1.0], [4.8.0])
 
 dnl *************************************************
diff --git a/libxfce4ui/xfce-heading.c b/libxfce4ui/xfce-heading.c
index df29216..f7e16b5 100644
--- a/libxfce4ui/xfce-heading.c
+++ b/libxfce4ui/xfce-heading.c
@@ -99,7 +99,7 @@ static void
 _xfce_heading_init (XfceHeading *heading)
 {
   /* setup the widget parameters */
-  GTK_WIDGET_UNSET_FLAGS (heading, GTK_NO_WINDOW);
+  gtk_widget_set_has_window (GTK_WIDGET (heading), FALSE);
 }
 
 
@@ -128,7 +128,7 @@ _xfce_heading_realize (GtkWidget *widget)
   GdkWindowAttr attributes;
 
   /* mark the widget as realized */
-  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+  gtk_widget_set_realized (widget, TRUE);
 
   /* setup the window attributes */
   attributes.x = widget->allocation.x;
@@ -198,7 +198,7 @@ _xfce_heading_style_set (GtkWidget *widget,
                          GtkStyle  *previous_style)
 {
   /* check if we're already realized */
-  if (GTK_WIDGET_REALIZED (widget))
+  if (gtk_widget_get_realized (widget))
     {
       /* set background color (using the base color) */
       gdk_window_set_background (widget->window, &widget->style->base[GTK_STATE_NORMAL]);
@@ -258,7 +258,7 @@ _xfce_heading_expose_event (GtkWidget      *widget,
 
   /* render the title */
   gtk_paint_layout (widget->style, widget->window,
-                    GTK_WIDGET_STATE (widget), TRUE, &event->area,
+                    gtk_widget_get_state (widget), TRUE, &event->area,
                     widget, "heading", (rtl ? x - width : x), y, layout);
 
   /* release the layout */
diff --git a/libxfce4ui/xfce-titled-dialog.c b/libxfce4ui/xfce-titled-dialog.c
index 5c8939d..f8b0558 100644
--- a/libxfce4ui/xfce-titled-dialog.c
+++ b/libxfce4ui/xfce-titled-dialog.c
@@ -216,7 +216,7 @@ xfce_titled_dialog_close (GtkDialog *dialog)
   GdkEvent *event;
 
   /* verify that the dialog is realized */
-  if (G_LIKELY (GTK_WIDGET_REALIZED (dialog)))
+  if (G_LIKELY (gtk_widget_get_realized (GTK_WIDGET (dialog))))
     {
       /* send a delete event to the dialog */
       event = gdk_event_new (GDK_DELETE);