diff --git a/pkgs/development/ocaml-modules/uucd/default.nix b/pkgs/development/ocaml-modules/uucd/default.nix
index d44309b266a5..89d9d545e57d 100644
--- a/pkgs/development/ocaml-modules/uucd/default.nix
+++ b/pkgs/development/ocaml-modules/uucd/default.nix
@@ -6,11 +6,11 @@ let
 in
 stdenv.mkDerivation rec {
   name = "ocaml-${pname}-${version}";
-  version = "4.0.0";
+  version = "10.0.0";
 
   src = fetchurl {
     url = "${webpage}/releases/${pname}-${version}.tbz";
-    sha256 = "11cjfwa4wjhsyvzq4wl9z44xi28n49drz8nbfpx754vyfzwj3yc6";
+    sha256 = "0cdyg6vaic4n58w80qriwvaq1c40ng3fh74ilxrwajbq163k055q";
   };
 
   buildInputs = [ ocaml findlib ocamlbuild opam topkg ];