diff --git a/pkgs/development/ocaml-modules/pbkdf/default.nix b/pkgs/development/ocaml-modules/pbkdf/default.nix
index 41dc6394e84c..5dedd200a825 100644
--- a/pkgs/development/ocaml-modules/pbkdf/default.nix
+++ b/pkgs/development/ocaml-modules/pbkdf/default.nix
@@ -10,12 +10,14 @@ buildDunePackage rec {
   pname = "pbkdf";
   version = "1.2.0";
 
+  duneVersion = "3";
+
   src = fetchzip {
     url = "https://github.com/abeaumont/ocaml-pbkdf/archive/${version}.tar.gz";
     sha256 = "sha256-dGi4Vw+7VBpK/NpJ6zdpogm+E6G/oJovXCksJBSmqjI=";
   };
 
-  minimalOCamlVersion = "4.07";
+  minimalOCamlVersion = "4.08";
   propagatedBuildInputs = [ cstruct mirage-crypto ];
   nativeCheckInputs = [ alcotest ];
   doCheck = true;