diff --git a/pkgs/development/python-modules/simplekv/default.nix b/pkgs/development/python-modules/simplekv/default.nix
index 12e2449b04c5..22851e6da57b 100644
--- a/pkgs/development/python-modules/simplekv/default.nix
+++ b/pkgs/development/python-modules/simplekv/default.nix
@@ -1,17 +1,19 @@
-{ lib
-, buildPythonPackage
-, dulwich
-, fetchFromGitHub
-, mock
-, pytestCheckHook
-, pythonOlder
-, six
+{
+  lib,
+  buildPythonPackage,
+  dulwich,
+  fetchFromGitHub,
+  mock,
+  pytestCheckHook,
+  pythonOlder,
+  setuptools,
+  six,
 }:
 
 buildPythonPackage rec {
   pname = "simplekv";
   version = "0.14.1";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
@@ -22,16 +24,16 @@ buildPythonPackage rec {
     hash = "sha256-seUGDj2q84+AjDFM1pxMLlHbe9uBgEhmqA96UHjnCmo=";
   };
 
-  nativeCheckInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     dulwich
     mock
     pytestCheckHook
     six
   ];
 
-  pythonImportsCheck = [
-    "simplekv"
-  ];
+  pythonImportsCheck = [ "simplekv" ];
 
   disabledTests = [
     # Issue with fixture