diff --git a/pkgs/development/ocaml-modules/csv/1.5.nix b/pkgs/development/ocaml-modules/csv/1.5.nix
deleted file mode 100644
index ef4ae4484d83..000000000000
--- a/pkgs/development/ocaml-modules/csv/1.5.nix
+++ /dev/null
@@ -1,38 +0,0 @@
-{ lib, stdenv, fetchzip, ocaml, findlib, ocamlbuild }:
-
-stdenv.mkDerivation rec {
-  pname = "ocaml${ocaml.version}-csv";
-  version = "1.5";
-
-  src = fetchzip {
-    url = "https://github.com/Chris00/ocaml-csv/releases/download/${version}/csv-${version}.tar.gz";
-    sha256 = "1ca7jgg58j24pccs5fshis726s06fdcjshnwza5kwxpjgdbvc63g";
-  };
-
-  nativeBuildInputs = [ ocaml findlib ocamlbuild ];
-
-  strictDeps = true;
-
-  createFindlibDestdir = true;
-
-  configurePhase = "ocaml setup.ml -configure --prefix $out --enable-tests";
-
-  buildPhase = "ocaml setup.ml -build";
-
-  doCheck = true;
-  checkPhase = "ocaml setup.ml -test";
-
-  installPhase = ''
-    runHook preInstall
-    ocaml setup.ml -install
-    runHook postInstall
-  '';
-
-  meta = with lib; {
-    description = "A pure OCaml library to read and write CSV files";
-    homepage = "https://github.com/Chris00/ocaml-csv";
-    license = licenses.lgpl21;
-    maintainers = [ maintainers.vbgl ];
-    inherit (ocaml.meta) platforms;
-  };
-}
diff --git a/pkgs/development/ocaml-modules/csv/csvtool.nix b/pkgs/development/ocaml-modules/csv/csvtool.nix
index 12c0dfa160e6..05d9a440f9c1 100644
--- a/pkgs/development/ocaml-modules/csv/csvtool.nix
+++ b/pkgs/development/ocaml-modules/csv/csvtool.nix
@@ -4,7 +4,9 @@ let inherit (ocamlPackages) buildDunePackage csv uutf; in
 
 buildDunePackage {
   pname = "csvtool";
-  inherit (csv) src version useDune2;
+  inherit (csv) src version;
+
+  duneVersion = "3";
 
   buildInputs = [ csv uutf ];
 
diff --git a/pkgs/development/ocaml-modules/csv/default.nix b/pkgs/development/ocaml-modules/csv/default.nix
index d4c3d72a6d80..7510dcede3a9 100644
--- a/pkgs/development/ocaml-modules/csv/default.nix
+++ b/pkgs/development/ocaml-modules/csv/default.nix
@@ -9,7 +9,11 @@ buildDunePackage rec {
     sha256 = "13m9n8mdss6jfbiw7d5bybxn4n85vmg4zw7dc968qrgjfy0w9zhk";
   };
 
-  useDune2 = true;
+  preConfigure = ''
+    substituteInPlace src/dune --replace '(libraries bytes)' ""
+  '';
+
+  duneVersion = "3";
 
   meta = {
     description = "A pure OCaml library to read and write CSV files";
diff --git a/pkgs/development/ocaml-modules/csv/lwt.nix b/pkgs/development/ocaml-modules/csv/lwt.nix
index c90dc019b9d4..8e91decfd65f 100644
--- a/pkgs/development/ocaml-modules/csv/lwt.nix
+++ b/pkgs/development/ocaml-modules/csv/lwt.nix
@@ -1,14 +1,16 @@
-{ lib, buildDunePackage, ocaml, csv, ocaml_lwt }:
-
-if lib.versionOlder ocaml.version "4.02"
-then throw "csv-lwt is not available for OCaml ${ocaml.version}"
-else
+{ lib, buildDunePackage, csv, lwt }:
 
 buildDunePackage {
   pname = "csv-lwt";
-  inherit (csv) src version useDune2 meta;
+  inherit (csv) src version meta;
 
-  propagatedBuildInputs = [ csv ocaml_lwt ];
+  preConfigure = ''
+    substituteInPlace lwt/dune --replace '(libraries   bytes' '(libraries '
+  '';
 
-  doCheck = lib.versionAtLeast ocaml.version "4.03";
+  duneVersion = "3";
+
+  propagatedBuildInputs = [ csv lwt ];
+
+  doCheck = true;
 }
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 617281df58a9..d1e599d8970f 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -263,10 +263,7 @@ let
 
     cstruct-unix = callPackage ../development/ocaml-modules/cstruct/unix.nix {};
 
-    csv =
-      if lib.versionAtLeast ocaml.version "4.2"
-      then callPackage ../development/ocaml-modules/csv { }
-      else callPackage ../development/ocaml-modules/csv/1.5.nix { };
+    csv = callPackage ../development/ocaml-modules/csv { };
 
     csv-lwt = callPackage ../development/ocaml-modules/csv/lwt.nix { };