diff --git a/docs/reference/gtk/migrating-4to5.md b/docs/reference/gtk/migrating-4to5.md
index b147fc61ca..30e9e2d6e0 100644
--- a/docs/reference/gtk/migrating-4to5.md
+++ b/docs/reference/gtk/migrating-4to5.md
@@ -119,3 +119,17 @@ it no longer has a resize handle for the window.
 
 These are very specialized widgets that should better live with the application
 where they are used.
+
+## Widget size api changes
+
+The functions gtk_widget_get_allocated_width() and gtk_widget_get_allocated_height()
+are going away. In most cases, [method@Gtk.Widget.get_width] and [method@Gtk.Widget.get_height]
+are suitable replacements. Note that the semantics are slightly different though:
+the old functions return the size of the CSS border area, while the new functions return
+the size of the widgets content area. In places where this difference matters, you can
+use `gtk_widget_compute_bounds (widget, widget, &bounds)` instead.
+
+The function gtk_widget_get_allocation() is also going away. It does not have a direct
+replacement, but the previously mentioned alternatives can be used for it too.
+
+The function gtk_widget_get_allocated_baseline() has been renamed to [method@Gtk.Widget.get_baseline].
diff --git a/gsk/gl/gskglrenderjob.c b/gsk/gl/gskglrenderjob.c
index 051619528c..d3bdef751d 100644
--- a/gsk/gl/gskglrenderjob.c
+++ b/gsk/gl/gskglrenderjob.c
@@ -4145,6 +4145,7 @@ gsk_gl_render_job_visit_node_with_offscreen (GskGLRenderJob       *job,
                                                      flipped_x ? -1 : 1,
                                                      flipped_y ? -1 : 1);
       gsk_gl_render_job_push_modelview (job, transform);
+      gsk_transform_unref (transform);
     }
 
   gsk_gl_render_job_transform_bounds (job, offscreen->bounds, &viewport);
@@ -4182,6 +4183,7 @@ gsk_gl_render_job_visit_node_with_offscreen (GskGLRenderJob       *job,
     {
       GskTransform *transform = gsk_transform_scale (NULL, downscale_x, downscale_y);
       gsk_gl_render_job_push_modelview (job, transform);
+      gsk_transform_unref (transform);
       gsk_gl_render_job_transform_bounds (job, offscreen->bounds, &viewport);
     }