diff --git a/pkgs/development/ocaml-modules/uuuu/default.nix b/pkgs/development/ocaml-modules/uuuu/default.nix
index 8965114543e7..5311e5731705 100644
--- a/pkgs/development/ocaml-modules/uuuu/default.nix
+++ b/pkgs/development/ocaml-modules/uuuu/default.nix
@@ -1,32 +1,18 @@
 {
-  angstrom,
   buildDunePackage,
   fetchurl,
-  findlib,
   lib,
-  ocaml,
-  re,
 }:
 
 buildDunePackage rec {
   pname = "uuuu";
-  version = "0.3.0";
+  version = "0.4.0";
 
   src = fetchurl {
     url = "https://github.com/mirage/uuuu/releases/download/v${version}/uuuu-${version}.tbz";
-    sha256 = "sha256:19n39yc7spgzpk9i70r0nhkwsb0bfbvbgpf8d863p0a3wgryhzkb";
+    hash = "sha256-5+GNk9s36ZocrAjuvlDIiQTq6WF9q0M8j3h/TakrGSg=";
   };
 
-  postPatch = ''
-    substituteInPlace src/dune --replace 'ocaml} ' \
-      'ocaml} -I ${findlib}/lib/ocaml/${ocaml.version}/site-lib '
-  '';
-
-  nativeBuildInputs = [ findlib ];
-
-  buildInputs = [ angstrom ];
-
-  checkInputs = [ re ];
   doCheck = true;
 
   duneVersion = "3";