diff --git a/ocaml-pkgs/catala.nix b/ocaml-pkgs/catala.nix
new file mode 100644
index 0000000..0ca49ae
--- /dev/null
+++ b/ocaml-pkgs/catala.nix
@@ -0,0 +1,82 @@
+{
+  lib,
+  fetchFromGitHub,
+  buildDunePackage,
+
+  menhirLib,
+  menhir,
+  re,
+  otoml,
+  ubase,
+  ocamlgraph,
+  uutf,
+  js_of_ocaml,
+  zarith_stubs_js,
+  bindlib,
+  alcotest,
+  dates_calc,
+  sedlex,
+  js_of_ocaml-ppx,
+  zarith,
+  ocolor,
+  unionFind,
+  visitors,
+  ninja_utils,
+  ocaml-crunch,
+  obelisk,
+  cppo,
+  groff,
+}:
+
+buildDunePackage rec {
+  pname = "catala";
+  version = "0.10.0";
+
+  minimalOCamlVersion = "4.14";
+  duneVersion = "3";
+
+  src = fetchFromGitHub {
+    owner = "CatalaLang";
+    repo = "catala";
+    rev = version;
+    hash = "sha256-JMDJJ+KIIlWMcKhKGUGwPy5+XoiVd0b/uXKAIn85n/Q=";
+  };
+
+  buildInputs = [
+    menhirLib
+    js_of_ocaml
+    re
+    otoml
+    ubase
+    ocamlgraph
+    uutf
+    zarith_stubs_js
+    bindlib
+    alcotest
+    dates_calc
+    sedlex
+    js_of_ocaml-ppx
+    zarith
+    ocolor
+    unionFind
+    visitors
+    ninja_utils
+  ];
+  nativeBuildInputs = [
+    menhir
+    js_of_ocaml
+    ocaml-crunch
+    obelisk
+    cppo
+    groff
+  ];
+
+  meta = {
+    description = "Programming language for literate programming law specification";
+    homepage = "https://github.com/CatalaLang/catala";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ ];
+    mainProgram = "catala";
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/overlay.nix b/overlay.nix
index c9c92e7..c66812d 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -21,4 +21,7 @@ mkGeneralOverlay ./pkgs final prev
   ocamlPackagesExtensions = (prev.ocamlPackagesExtensions or [ ]) ++ [
     (mkGeneralOverlay ./ocaml-pkgs)
   ];
+
+  # tools from language specific pkgs sets
+  inherit (final.ocamlPackages) catala;
 }