diff --git a/pkgs/development/python-modules/phonenumbers/default.nix b/pkgs/development/python-modules/phonenumbers/default.nix
index bb8ff792286d..17d232e97f7e 100644
--- a/pkgs/development/python-modules/phonenumbers/default.nix
+++ b/pkgs/development/python-modules/phonenumbers/default.nix
@@ -4,12 +4,13 @@
   fetchPypi,
   pytestCheckHook,
   pythonOlder,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "phonenumbers";
   version = "8.13.46";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
@@ -18,6 +19,8 @@ buildPythonPackage rec {
     hash = "sha256-lL8Yupclu2ho0pRzsT947wHiWFxctWHsAgC+dnbndFI=";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pytestFlagsArray = [ "tests/*.py" ];