diff --git a/pkgs/development/ocaml-modules/ppx_tools/default.nix b/pkgs/development/ocaml-modules/ppx_tools/default.nix
index cc525d1d1e9..d3af0ea154e 100644
--- a/pkgs/development/ocaml-modules/ppx_tools/default.nix
+++ b/pkgs/development/ocaml-modules/ppx_tools/default.nix
@@ -34,6 +34,7 @@ let param =
   "4.12" = v6_6;
   "4.13" = v6_6;
   "4.14" = v6_6;
+  "5.0" = v6_6;
 }.${ocaml.meta.branch};
 in
 
@@ -56,6 +57,7 @@ then
   buildDunePackage {
     inherit pname src meta;
     inherit (param) version buildInputs nativeBuildInputs;
+    duneVersion = "3";
 
     strictDeps = true;
   }