diff --git a/pkgs/development/ocaml-modules/mm/default.nix b/pkgs/development/ocaml-modules/mm/default.nix
index 6895a29fb1ac..0425bcafa639 100644
--- a/pkgs/development/ocaml-modules/mm/default.nix
+++ b/pkgs/development/ocaml-modules/mm/default.nix
@@ -4,7 +4,9 @@
 
 buildDunePackage rec {
   pname = "mm";
-  version = "0.8.1";
+  version = "0.8.2";
+
+  duneVersion = "3";
 
   minimalOCamlVersion = "4.12";
 
@@ -12,7 +14,7 @@ buildDunePackage rec {
     owner = "savonet";
     repo = "ocaml-mm";
     rev = "v${version}";
-    sha256 = "sha256-7ozt+OgKNxMnjl2R+/ce27ZyL+T6BShvnnFE5BasJC4=";
+    sha256 = "sha256-EifM96MWIDyr1EVUZYuISWGwbMshVQppzWLJchqzV2E=";
   };
 
   buildInputs = [ dune-configurator ];