diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### 3.0.18
+
++ Fix introspection info for [buttonSetImage](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-Button.html#v:buttonSetImage). Image parameter can be null.
+
 ### 3.0.15
 
 + Fix introspection info for [uIManagerGetAction](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-UIManager.html#v:uIManagerGetAction), [uIManagerGetWidget](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-UIManager.html#v:uIManagerGetWidget), [actionGroupGetAction](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-ActionGroup.html#v:actionGroupGetAction), [textMarkGetName](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-TextMark.html#v:textMarkGetName) and [notebookGetTabLabel](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-Notebook.html#v:notebookGetTabLabel). In all these cases the function can return NULL, but it was not marked as such in the introspection data.
diff --git a/Gtk.overrides b/Gtk.overrides
--- a/Gtk.overrides
+++ b/Gtk.overrides
@@ -163,6 +163,7 @@
 set-attr Gtk/BuilderConnectFunc/@parameters/user_data nullable 1
 set-attr Gtk/Button/new_from_icon_name/@parameters/icon_name nullable 1
 set-attr Gtk/Button/get_image/@return-value nullable 1
+set-attr Gtk/Button/set_image/@parameters/image nullable 1
 set-attr Gtk/Calendar/set_detail_func/@parameters/data nullable 1
 set-attr Gtk/CalendarDetailFunc/@return-value nullable 1
 set-attr Gtk/CalendarDetailFunc/@parameters/user_data nullable 1
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-3.0.17/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.17/docs/GI-Gtk.html)
+[https://hackage.haskell.org/package/gi-gtk-3.0.18/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.18/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:              3.0.17
+version:              3.0.18
 synopsis:             Gtk bindings
 description:          Bindings for Gtk, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi