diff --git a/pkgs/desktops/gnome-3/3.12/core/gtksourceview/default.nix b/pkgs/desktops/gnome-3/3.12/core/gtksourceview/default.nix
index 4564b0d21e1..8a89425a696 100644
--- a/pkgs/desktops/gnome-3/3.12/core/gtksourceview/default.nix
+++ b/pkgs/desktops/gnome-3/3.12/core/gtksourceview/default.nix
@@ -3,11 +3,11 @@
 
 stdenv.mkDerivation rec {
   name = "gtksourceview-${version}";
-  version = "3.12.2";
+  version = "3.12.3";
 
   src = fetchurl {
     url = "mirror://gnome/sources/gtksourceview/3.12/gtksourceview-${version}.tar.xz";
-    sha256 = "62a31eee00f633d7959efb7eec44049ebd0345d670265853dcd21c057f3f30ad";
+    sha256 = "1xzmw9n9zbkaasl8xi7s5h49wiv5dq4qf8hr2pzjkack3ai5j6gk";
   };
 
   buildInputs = [ pkgconfig atk cairo glib gtk3 pango