diff --git a/pkgs/development/python-modules/cobs/default.nix b/pkgs/development/python-modules/cobs/default.nix
index d96d4e15fa2d..3b5ae835184f 100644
--- a/pkgs/development/python-modules/cobs/default.nix
+++ b/pkgs/development/python-modules/cobs/default.nix
@@ -2,18 +2,21 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "cobs";
   version = "1.2.2";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
     hash = "sha256-291eMhEdcnhvg9DCaSFdzWrGKbGsGWLGh4Ih87LKmNo=";
   };
 
+  build-system = [ setuptools ];
+
   checkPhase = ''
     runHook preCheck