diff --git a/pkgs/development/ocaml-modules/uucd/default.nix b/pkgs/development/ocaml-modules/uucd/default.nix
index 0c71ddf0d70..c89a40a50b2 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 = "14.0.0";
+  version = "15.0.0";
 
   src = fetchurl {
     url = "${webpage}/releases/${pname}-${version}.tbz";
-    sha256 = "sha256:0fc737v5gj3339jx4x9xr096lxrpwvp6vaiylhavcvsglcwbgm30";
+    sha256 = "sha256-DksDi6Dfe/fNGBmeubwxv9dScTHPJRuaPrlX7M8QRrw=";
   };
 
   nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ];
diff --git a/pkgs/development/ocaml-modules/uucp/default.nix b/pkgs/development/ocaml-modules/uucp/default.nix
index 42705e20d3f..476a4529f3f 100644
--- a/pkgs/development/ocaml-modules/uucp/default.nix
+++ b/pkgs/development/ocaml-modules/uucp/default.nix
@@ -2,7 +2,7 @@
 
 let
   pname = "uucp";
-  version = "14.0.0";
+  version = "15.0.0";
   webpage = "https://erratique.ch/software/${pname}";
   minimumOCamlVersion = "4.03";
   doCheck = true;
@@ -18,7 +18,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "${webpage}/releases/${pname}-${version}.tbz";
-    sha256 = "sha256:1yx9nih3d9prb9zizq8fzmmqylf24a6yifhf81h33znrj5xn1mpj";
+    sha256 = "sha256-rEeU9AWpCzuAtAOe7hJHBmJjP97BZsQsPFQQ8uZLUzA=";
   };
 
   nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ];