diff --git a/pkgs/development/ocaml-modules/mccs/default.nix b/pkgs/development/ocaml-modules/mccs/default.nix
index 2c0fa7186e84a..cb77d21479ca6 100644
--- a/pkgs/development/ocaml-modules/mccs/default.nix
+++ b/pkgs/development/ocaml-modules/mccs/default.nix
@@ -2,13 +2,13 @@
 
 buildDunePackage rec {
   pname = "mccs";
-  version = "1.1+17";
+  version = "1.1+18";
 
   src = fetchFromGitHub {
     owner = "AltGr";
     repo = "ocaml-mccs";
     rev = version;
-    hash = "sha256-0NZF2W/eWwZRXnMJh9LmOdbE/CRDYeLUUx6ty4irP6U=";
+    hash = "sha256-Swfqq7O5KASf1nkK/lgIO9byWDUv1FiWh8cNULF7wfI=";
   };
 
   propagatedBuildInputs = [