diff --git a/pkgs/development/ocaml-modules/labltk/default.nix b/pkgs/development/ocaml-modules/labltk/default.nix
index 90bd678f287f..fd7e59424547 100644
--- a/pkgs/development/ocaml-modules/labltk/default.nix
+++ b/pkgs/development/ocaml-modules/labltk/default.nix
@@ -46,6 +46,10 @@ let
     version = "8.06.12";
     sha256 = "sha256:17fmb13l18isgwr38hg9r5a0nayf2hhw6acj5153cy1sygsdg3b5";
   };
+  "5.0" = mkNewParam {
+    version = "8.06.13";
+    sha256 = "sha256-Vpf13g3DEWlUI5aypiowGp2fkQPK0cOGv2XiRUY/Ip4=";
+  };
  };
  param = params . ${lib.versions.majorMinor ocaml.version}
    or (throw "labltk is not available for OCaml ${ocaml.version}");