diff --git a/pkgs/development/python-modules/cock/default.nix b/pkgs/development/python-modules/cock/default.nix
index b93a106afdd8..4ead91e94aac 100644
--- a/pkgs/development/python-modules/cock/default.nix
+++ b/pkgs/development/python-modules/cock/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
   click,
   sortedcontainers,
   pyyaml,
@@ -10,14 +11,16 @@
 buildPythonPackage rec {
   pname = "cock";
   version = "0.11.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
     hash = "sha256-Hi8aFxATsYcEO6qNzZnF73V8WLTQjb6Dw2xF4VgT2o4=";
   };
 
-  propagatedBuildInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     click
     sortedcontainers
     pyyaml