diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+### 3.0.9
+
++ The return value of [windowGet](https://hackage.haskell.org/package/gi-wnck-3.0.9/docs/GI-Wnck-Objects-Window.html#g:method:get) is nullable, but it was not marked as such in the introspection data, see [issue 302](https://github.com/haskell-gi/haskell-gi/issues/302).
+
 ### 3.0.8
 
 + Upgrade to haskell-gi-base-0.24
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-wnck-3.0.8/docs/GI-Wnck.html](https://hackage.haskell.org/package/gi-wnck-3.0.8/docs/GI-Wnck.html)
+[https://hackage.haskell.org/package/gi-wnck-3.0.9/docs/GI-Wnck.html](https://hackage.haskell.org/package/gi-wnck-3.0.9/docs/GI-Wnck.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/Wnck.overrides b/Wnck.overrides
--- a/Wnck.overrides
+++ b/Wnck.overrides
@@ -2,3 +2,5 @@
 set-attr Wnck/Screen/get_active_workspace/@return-value nullable 1
 
 set-attr Wnck/ScreenClass/active_window_changed/@parameters/previous_window nullable 1
+
+set-attr Wnck/Window/get/@return-value nullable 1
diff --git a/gi-wnck.cabal b/gi-wnck.cabal
--- a/gi-wnck.cabal
+++ b/gi-wnck.cabal
@@ -1,5 +1,5 @@
 name:                 gi-wnck
-version:              3.0.8
+version:              3.0.9
 synopsis:             Wnck bindings
 description:          Bindings for wnck, autogenerated by haskell-gi.
 homepage:             https://github.com/haskell-gi/haskell-gi
@@ -16,7 +16,7 @@
 custom-setup
       setup-depends: base >= 4.9 && < 5,
                      Cabal >= 1.24,
-                     haskell-gi >= 0.24 && < 0.25,
+                     haskell-gi >= 0.24.1 && < 0.25,
                      gi-gdk == 3.0.*,
                      gi-gdkpixbuf == 2.0.*,
                      gi-gtk == 3.0.*,
@@ -32,7 +32,7 @@
       pkgconfig-depends: libwnck-3.0
       build-depends: base >= 4.7 && <5,
                      haskell-gi-base >= 0.24 && < 0.25,
-                     haskell-gi >= 0.24.0 && < 0.25,
+                     haskell-gi >= 0.24.1 && < 0.25,
                      haskell-gi-overloading < 1.1,
                      gi-gdk == 3.0.*,
                      gi-gdkpixbuf == 2.0.*,