diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### 3.0.22
+
++ The return of [`applicationNew`](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-Application.html#v:applicationNew) value can be null, but it is not marked as such in the introspection data, leading to a rather confusing error message (see [issue 142](https://github.com/haskell-gi/haskell-gi/issues/142) and [issue 143](https://github.com/haskell-gi/haskell-gi/issues/143)).
+
 ### 3.0.21
 
 + The return value of [`widgetDragDestFindTarget`](https://hackage.haskell.org/package/gi-gtk/docs/GI-Gtk-Objects-Widget.html#v:widgetDragDestFindTarget) is nullable, but was not marked as such.
diff --git a/Gtk.overrides b/Gtk.overrides
--- a/Gtk.overrides
+++ b/Gtk.overrides
@@ -69,6 +69,12 @@
 set-attr Gtk/Widget/intersect/@parameters/intersection caller-allocates 1
 set-attr Gtk/Widget/intersect/@parameters/intersection nullable 0
 
+# The return value can be null, but it is not marked as such in the
+# introspection data, leading to a rather confusing error message:
+# https://github.com/haskell-gi/haskell-gi/issues/142
+# https://github.com/haskell-gi/haskell-gi/issues/143
+set-attr Gtk/Application/new/@return-value nullable 1
+
 # Generated from gtk+ 3.22.11 with xsltproc Nullable.xslt Gtk-3.0.gir
 set-attr Gtk/AboutDialog/set_comments/@parameters/comments nullable 1
 set-attr Gtk/AboutDialog/set_copyright/@parameters/copyright 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-3.0.21/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.21/docs/GI-Gtk.html)
+[https://hackage.haskell.org/package/gi-gtk-3.0.22/docs/GI-Gtk.html](https://hackage.haskell.org/package/gi-gtk-3.0.22/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:              3.0.21
+version:              3.0.22
 synopsis:             Gtk bindings
 description:          Bindings for Gtk, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi