diff --git a/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/2.1.x.nix b/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/2.1.x.nix
new file mode 100644
index 00000000000..afe3d34963a
--- /dev/null
+++ b/pkgs/development/ocaml-modules/ocaml-migrate-parsetree/2.1.x.nix
@@ -0,0 +1,20 @@
+{ lib, fetchurl, buildDunePackage }:
+
+buildDunePackage rec {
+   pname = "ocaml-migrate-parsetree";
+   version = "2.1.0";
+
+   minimumOCamlVersion = "4.02";
+
+   src = fetchurl {
+     url = "https://github.com/ocaml-ppx/${pname}/releases/download/v${version}/${pname}-v${version}.tbz";
+     sha256 = "07x7lm45kny0mi0fjvzw51445brm0dgy099cw0gpyly0wj77hyrq";
+   };
+
+   meta = {
+     description = "Convert OCaml parsetrees between different major versions";
+     license = lib.licenses.lgpl21;
+     maintainers = with lib.maintainers; [ vbgl sternenseemann ];
+     homepage = "https://github.com/ocaml-ppx/ocaml-migrate-parsetree";
+   };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index b4bf6f7852e..5e4f350099a 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -666,6 +666,8 @@ let
 
     ocaml-migrate-parsetree-1-8 = callPackage ../development/ocaml-modules/ocaml-migrate-parsetree/1.8.x.nix { };
 
+    ocaml-migrate-parsetree-2-1 = callPackage ../development/ocaml-modules/ocaml-migrate-parsetree/2.1.x.nix { };
+
     ocamlmod = callPackage ../development/tools/ocaml/ocamlmod { };
 
     ocaml-monadic = callPackage ../development/ocaml-modules/ocaml-monadic { };