diff --git a/pkgs/tools/archivers/undmg/default.nix b/pkgs/tools/archivers/undmg/default.nix
index 4d6127826a0f..a2b0bf006c83 100644
--- a/pkgs/tools/archivers/undmg/default.nix
+++ b/pkgs/tools/archivers/undmg/default.nix
@@ -5,18 +5,19 @@
   zlib,
   bzip2,
   lzfse,
+  xz,
   pkg-config,
 }:
 
-stdenv.mkDerivation rec {
-  version = "1.1.0";
+stdenv.mkDerivation {
   pname = "undmg";
+  version = "1.1.0-unstable-2024-08-02";
 
   src = fetchFromGitHub {
     owner = "matthewbauer";
     repo = "undmg";
-    rev = "v${version}";
-    sha256 = "0rb4h89jrl04vwf6p679ipa4mp95hzmc1ca11wqbanv3xd1kcpxm";
+    rev = "0d92602b694f810fa4b137d87c743f345b303a14";
+    hash = "sha256-eLxI3enf8EAgQePXvWxw8kOMr7KP2Q1Rsxy++v16zQI=";
   };
 
   nativeBuildInputs = [ pkg-config ];
@@ -25,6 +26,7 @@ stdenv.mkDerivation rec {
     zlib
     bzip2
     lzfse
+    xz
   ];
 
   setupHook = ./setup-hook.sh;