diff --git a/pkgs/by-name/md/mdk/package.nix b/pkgs/by-name/md/mdk/package.nix
index 9f2acbcdf266..533d250b21d3 100644
--- a/pkgs/by-name/md/mdk/package.nix
+++ b/pkgs/by-name/md/mdk/package.nix
@@ -9,10 +9,10 @@
 
 stdenv.mkDerivation rec {
   pname = "gnu-mdk";
-  version = "1.3.0";
+  version = "1.3.1";
   src = fetchurl {
     url = "mirror://gnu/mdk/v${version}/mdk-${version}.tar.gz";
-    sha256 = "0bhk3c82kyp8167h71vdpbcr852h5blpnwggcswqqwvvykbms7lb";
+    sha256 = "sha256-67ljk4xojBUP9qrtwp8w0JAgoeMdVbMMIQHwh3NRbRk=";
   };
   nativeBuildInputs = [
     pkg-config