diff --git a/pkgs/development/ocaml-modules/mm/default.nix b/pkgs/development/ocaml-modules/mm/default.nix
index a9a393faf5d9..b0896d2fd6a7 100644
--- a/pkgs/development/ocaml-modules/mm/default.nix
+++ b/pkgs/development/ocaml-modules/mm/default.nix
@@ -4,7 +4,7 @@
 
 buildDunePackage rec {
   pname = "mm";
-  version = "0.8.5";
+  version = "0.8.6";
 
   duneVersion = "3";
 
@@ -14,7 +14,7 @@ buildDunePackage rec {
     owner = "savonet";
     repo = "ocaml-mm";
     rev = "v${version}";
-    sha256 = "sha256-/83coQdUoaa1+5yapF/joV87uYpVsmWU7LH867Vmmo0=";
+    sha256 = "sha256-ME6Naza7OvZ/63zEjrPeKq5JwMoMfV2fpkCuZdtCZ/c=";
   };
 
   buildInputs = [ dune-configurator ];