diff --git a/pkgs/development/ocaml-modules/opus/default.nix b/pkgs/development/ocaml-modules/opus/default.nix
index ecaf2090ca0..104846b87f6 100644
--- a/pkgs/development/ocaml-modules/opus/default.nix
+++ b/pkgs/development/ocaml-modules/opus/default.nix
@@ -4,13 +4,13 @@ buildDunePackage rec {
   pname = "opus";
   version = "0.2.2";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "savonet";
     repo = "ocaml-opus";
     rev = "v${version}";
-    sha256 = "sha256-Ghfqw/J1oLbTJpYJaiB5M79jaA6DACvyxBVE+NjnPkg=";
+    hash = "sha256-Ghfqw/J1oLbTJpYJaiB5M79jaA6DACvyxBVE+NjnPkg=";
   };
 
   nativeBuildInputs = [ pkg-config ];