diff --git a/pkgs/development/python-modules/semver/default.nix b/pkgs/development/python-modules/semver/default.nix
index 7260baa5aa10..cb2ed61307b3 100644
--- a/pkgs/development/python-modules/semver/default.nix
+++ b/pkgs/development/python-modules/semver/default.nix
@@ -1,16 +1,17 @@
-{ lib
-, buildPythonPackage
-, fetchFromGitHub
-, pytestCheckHook
-, pythonOlder
-, setuptools
-, setuptools-scm
+{
+  lib,
+  buildPythonPackage,
+  fetchFromGitHub,
+  pytestCheckHook,
+  pythonOlder,
+  setuptools,
+  setuptools-scm,
 }:
 
 buildPythonPackage rec {
   pname = "semver";
   version = "3.0.2";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
@@ -21,35 +22,31 @@ buildPythonPackage rec {
     hash = "sha256-772PSUq1dqtn9aOol+Bo0S0OItBmoiCNP8q/YCBvKU4=";
   };
 
-  nativeBuildInputs = [
-    setuptools
-    setuptools-scm
-  ];
-
-  nativeCheckInputs = [
-    pytestCheckHook
-  ];
-
   postPatch = ''
     sed -i "/--cov/d" setup.cfg
     sed -i "/--no-cov-on-fail/d" setup.cfg
   '';
 
+  build-system = [
+    setuptools
+    setuptools-scm
+  ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
+
   disabledTestPaths = [
     # Don't test the documentation
     "docs/*.rst"
   ];
 
-  pythonImportsCheck = [
-    "semver"
-  ];
+  pythonImportsCheck = [ "semver" ];
 
   meta = with lib; {
     description = "Python package to work with Semantic Versioning (http://semver.org/)";
-    mainProgram = "pysemver";
     homepage = "https://python-semver.readthedocs.io/";
     changelog = "https://github.com/python-semver/python-semver/releases/tag/3.0.0";
     license = licenses.bsd3;
     maintainers = with maintainers; [ np ];
+    mainProgram = "pysemver";
   };
 }