diff --git a/pkgs/development/ocaml-modules/reactivedata/default.nix b/pkgs/development/ocaml-modules/reactivedata/default.nix
index 9be32d28bab..3aafd9807a0 100644
--- a/pkgs/development/ocaml-modules/reactivedata/default.nix
+++ b/pkgs/development/ocaml-modules/reactivedata/default.nix
@@ -1,34 +1,26 @@
-{ lib, stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, react, opaline }:
+{ lib, fetchFromGitHub, buildDunePackage, react }:
 
-if lib.versionOlder ocaml.version "4.04"
-then throw "reactiveData is not available for OCaml ${ocaml.version}"
-else
-
-stdenv.mkDerivation rec {
-  pname = "ocaml${ocaml.version}-reactiveData";
-  version = "0.2.2";
+buildDunePackage rec {
+  pname = "reactiveData";
+  version = "0.3";
+  duneVersion = "3";
+  minimalOCamlVersion = "4.08";
 
   src = fetchFromGitHub {
     owner = "ocsigen";
     repo = "reactiveData";
     rev = version;
-    sha256 = "sha256-YLkacIbjxZQ/ThgSxjTqviBYih6eW2GX5H7iybQDv1A=";
+    sha256 = "sha256-imUphE1vMe3bYqHhgTuGT+B7uLn75acX6fAwBLh1tz4=";
   };
 
-  nativeBuildInputs = [ ocaml findlib ocamlbuild opaline ];
   propagatedBuildInputs = [ react ];
 
   strictDeps = true;
 
-  buildPhase = "ocaml pkg/build.ml native=true native-dynlink=true";
-
-  installPhase = "opaline -prefix $out -libdir $OCAMLFIND_DESTDIR";
-
   meta = with lib; {
     description = "An OCaml module for functional reactive programming (FRP) based on React";
     homepage = "https://github.com/ocsigen/reactiveData";
     license = licenses.lgpl21;
-    platforms = ocaml.meta.platforms or [ ];
     maintainers = with maintainers; [ vbgl ];
   };
 }
diff --git a/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix b/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
index e371c9f10bf..30d5af3d4b0 100644
--- a/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
+++ b/pkgs/development/tools/ocaml/js_of_ocaml/tyxml.nix
@@ -6,7 +6,8 @@
 buildDunePackage {
   pname = "js_of_ocaml-tyxml";
 
-  inherit (js_of_ocaml-compiler) version src useDune2;
+  inherit (js_of_ocaml-compiler) version src;
+  duneVersion = "3";
 
   buildInputs = [ js_of_ocaml-ppx ];