diff --git a/pkgs/development/python-modules/python-xapp/default.nix b/pkgs/development/python-modules/python-xapp/default.nix
index 698f9735fd21..54d8e7a256e1 100644
--- a/pkgs/development/python-modules/python-xapp/default.nix
+++ b/pkgs/development/python-modules/python-xapp/default.nix
@@ -15,7 +15,7 @@
 
 buildPythonPackage rec {
   pname = "python-xapp";
-  version = "2.4.2";
+  version = "3.0.0";
 
   format = "other";
 
@@ -23,7 +23,7 @@ buildPythonPackage rec {
     owner = "linuxmint";
     repo = "python-xapp";
     rev = version;
-    hash = "sha256-Gbm4YT9ZyrROOAbKz5xYd9J9YG9cUL2Oo6dDCPciaBs=";
+    hash = "sha256-OvYbMu/2cQLTHHbHh4zESf1X22AfZe8ZEfzeOBDcU90=";
   };
 
   nativeBuildInputs = [
@@ -43,6 +43,10 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace "xapp/os.py" \
       --replace-fail "/usr/bin/pkexec" "${polkit}/bin/pkexec"
+
+    # We actually want the localedir provided by the caller.
+    substituteInPlace "xapp/util/__init__.py" \
+      --replace-fail "/usr/share/locale" "/run/current-system/sw/share/locale"
   '';
 
   doCheck = false;