diff --git a/pkgs/development/libraries/atk/default.nix b/pkgs/development/libraries/atk/default.nix
index cd2ffe556647..1574d8d037c7 100644
--- a/pkgs/development/libraries/atk/default.nix
+++ b/pkgs/development/libraries/atk/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, perl, glib, libintlOrEmpty, gobjectIntrospection }:
 
 let
-  ver_maj = "2.22";
+  ver_maj = "2.26";
   ver_min = "0";
 in
 stdenv.mkDerivation rec {
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     url = "mirror://gnome/sources/atk/${ver_maj}/${name}.tar.xz";
-    sha256 = "d349f5ca4974c9c76a4963e5b254720523b0c78672cbc0e1a3475dbd9b3d44b6";
+    sha256 = "eafe49d5c4546cb723ec98053290d7e0b8d85b3fdb123938213acb7bb4178827";
   };
 
   enableParallelBuilding = true;