diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### 3.0.33
+
++ Mark the return argument of [comboBoxTextGetActiveText](https://hackage.haskell.org/package/gi-gtk-3.0.33/docs/GI-Gtk-Objects-ComboBoxText.html#v:comboBoxTextGetActiveText) as nullable. See [issue 264](https://github.com/haskell-gi/haskell-gi/issues/264).
+
 ### 3.0.32
 
 + Update for haskell-gi(-base)-0.23
diff --git a/Gtk.overrides b/Gtk.overrides
--- a/Gtk.overrides
+++ b/Gtk.overrides
@@ -38,6 +38,9 @@
 # https://bugzilla.gnome.org/show_bug.cgi?id=781246
 set-attr Gtk/Widget/get_parent_window/@return-value nullable 1
 
+# Nullablereturn value, but not marked as such
+set-attr Gtk/ComboBoxText/get_active_text/@return-value nullable 1
+
 # Wrong introspection data in old gtk versions, see
 # https://bugzilla.gnome.org/show_bug.cgi?id=674537
 set-attr Gtk/MenuPositionFunc/@parameters/x direction inout
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Documentation
 Autogenerated documentation for this package can be found at
 
-[https://hackage.haskell.org/package/gi-gtk-3.0.32/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.32/docs/GI-Gtk.html)
+[https://hackage.haskell.org/package/gi-gtk-3.0.33/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.33/docs/GI-Gtk.html)
 
 For general documentation on using [haskell-gi](https://github.com/haskell-gi/haskell-gi) based bindings, see [the project page](https://github.com/haskell-gi/haskell-gi) or [the Wiki](https://github.com/haskell-gi/haskell-gi/wiki).
diff --git a/gi-gtk.cabal b/gi-gtk.cabal
--- a/gi-gtk.cabal
+++ b/gi-gtk.cabal
@@ -1,5 +1,5 @@
 name:                 gi-gtk
-version:              3.0.32
+version:              3.0.33
 synopsis:             Gtk bindings
 description:          Bindings for Gtk, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi
@@ -200,6 +200,7 @@
                        GI.Gtk.Objects.HSeparator,
                        GI.Gtk.Objects.HandleBox,
                        GI.Gtk.Objects.HeaderBar,
+                       GI.Gtk.Objects.HeaderBarAccessible,
                        GI.Gtk.Objects.IMContext,
                        GI.Gtk.Objects.IMContextSimple,
                        GI.Gtk.Objects.IMMulticontext,
@@ -549,6 +550,7 @@
                        GI.Gtk.Objects.HSeparator,
                        GI.Gtk.Objects.HandleBox,
                        GI.Gtk.Objects.HeaderBar,
+                       GI.Gtk.Objects.HeaderBarAccessible,
                        GI.Gtk.Objects.IMContext,
                        GI.Gtk.Objects.IMContextSimple,
                        GI.Gtk.Objects.IMMulticontext,