diff --git a/pkgs/development/libraries/gtkmm/2.x.nix b/pkgs/development/libraries/gtkmm/2.x.nix
index 422fdebd9c86..014a919d1787 100644
--- a/pkgs/development/libraries/gtkmm/2.x.nix
+++ b/pkgs/development/libraries/gtkmm/2.x.nix
@@ -1,12 +1,12 @@
 { stdenv, fetchurl, pkgconfig, gtk2, glibmm, cairomm, pangomm, atkmm }:
 
 stdenv.mkDerivation rec {
-  name = "gtkmm-${minVer}.4";
+  name = "gtkmm-${minVer}.5";
   minVer = "2.24";
 
   src = fetchurl {
     url = "mirror://gnome/sources/gtkmm/${minVer}/${name}.tar.xz";
-    sha256 = "1vpmjqv0aqb1ds0xi6nigxnhlr0c74090xzi15b92amlzkrjyfj4";
+    sha256 = "0680a53b7bf90b4e4bf444d1d89e6df41c777e0bacc96e9c09fc4dd2f5fe6b72";
   };
 
   patches = [ ./gtkmm-2.24.4-missing-operator.patch ];