diff --git a/pkgs/applications/science/math/nauty/default.nix b/pkgs/applications/science/math/nauty/default.nix
index 4efe8da1918..986610eea60 100644
--- a/pkgs/applications/science/math/nauty/default.nix
+++ b/pkgs/applications/science/math/nauty/default.nix
@@ -4,10 +4,10 @@
 }:
 stdenv.mkDerivation rec {
   pname = "nauty";
-  version = "26r11";
+  version = "26r12";
   src = fetchurl {
     url = "http://pallini.di.uniroma1.it/nauty${version}.tar.gz";
-    sha256 = "05z6mk7c31j70md83396cdjmvzzip1hqb88pfszzc6k4gy8h3m2y";
+    sha256 = "1p4mxf8q5wm47nxyskxbqwa5p1vvkycv1zgswvnk9nsn6vff0al6";
   };
   outputs = [ "out" "dev" ];
   configureFlags = {