diff --git a/pkgs/development/ocaml-modules/mccs/default.nix b/pkgs/development/ocaml-modules/mccs/default.nix
index 50abdf631db8..09f3adf33805 100644
--- a/pkgs/development/ocaml-modules/mccs/default.nix
+++ b/pkgs/development/ocaml-modules/mccs/default.nix
@@ -2,17 +2,15 @@
 
 buildDunePackage rec {
   pname = "mccs";
-  version = "1.1+13";
+  version = "1.1+17";
 
   src = fetchFromGitHub {
     owner = "AltGr";
     repo = "ocaml-mccs";
     rev = version;
-    sha256 = "sha256-K249E9qkWNK4BC+ynaR3bVEyu9Tk8iCE7GptKk/aVJc=";
+    hash = "sha256-0NZF2W/eWwZRXnMJh9LmOdbE/CRDYeLUUx6ty4irP6U=";
   };
 
-  useDune2 = true;
-
   propagatedBuildInputs = [
     cudf
   ];