diff --git a/pkgs/development/tools/ocaml/ocaml-top/default.nix b/pkgs/development/tools/ocaml/ocaml-top/default.nix
index 18ea26ca22a8..517ef2ce9e6c 100644
--- a/pkgs/development/tools/ocaml/ocaml-top/default.nix
+++ b/pkgs/development/tools/ocaml/ocaml-top/default.nix
@@ -4,6 +4,8 @@ with ocamlPackages; buildDunePackage rec {
   pname = "ocaml-top";
   version = "1.2.0";
 
+  duneVersion = "3";
+
   src = fetchFromGitHub {
     owner = "OCamlPro";
     repo = "ocaml-top";
diff --git a/pkgs/development/tools/ocaml/ocp-indent/default.nix b/pkgs/development/tools/ocaml/ocp-indent/default.nix
index aae650fbdc25..649e1bcd3559 100644
--- a/pkgs/development/tools/ocaml/ocp-indent/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-indent/default.nix
@@ -1,10 +1,10 @@
-{ lib, fetchFromGitHub, buildDunePackage, cmdliner }:
+{ lib, fetchFromGitHub, buildDunePackage, cmdliner, findlib }:
 
 buildDunePackage rec {
   version = "1.8.2";
   pname = "ocp-indent";
 
-  useDune2 = true;
+  duneVersion = "3";
 
   src = fetchFromGitHub {
     owner = "OCamlPro";
@@ -13,9 +13,10 @@ buildDunePackage rec {
     sha256 = "sha256-IyvURw/6R0eKrnahV1fqLV0iIeypykrmxDbliECgbLc=";
   };
 
-  minimumOCamlVersion = "4.02";
+  minimalOCamlVersion = "4.03";
 
   buildInputs = [ cmdliner ];
+  propagatedBuildInputs = [ findlib ];
 
   meta = with lib; {
     homepage = "https://www.typerex.org/ocp-indent.html";
diff --git a/pkgs/development/tools/ocaml/ocp-index/default.nix b/pkgs/development/tools/ocaml/ocp-index/default.nix
index 6c315960f985..5b37febbb998 100644
--- a/pkgs/development/tools/ocaml/ocp-index/default.nix
+++ b/pkgs/development/tools/ocaml/ocp-index/default.nix
@@ -4,6 +4,8 @@ buildDunePackage rec {
   pname = "ocp-index";
   version = "1.3.4";
 
+  duneVersion = "3";
+
   minimalOCamlVersion = "4.08";
 
   src = fetchFromGitHub {