diff --git a/pkgs/development/python-modules/assertpy/default.nix b/pkgs/development/python-modules/assertpy/default.nix
index 186210157cad..cc07ebb17329 100644
--- a/pkgs/development/python-modules/assertpy/default.nix
+++ b/pkgs/development/python-modules/assertpy/default.nix
@@ -3,12 +3,13 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "assertpy";
   version = "1.1";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "assertpy";
@@ -17,6 +18,8 @@ buildPythonPackage rec {
     sha256 = "0hnfh45cmqyp7zasrllwf8gbq3mazqlhhk0sq1iqlh6fig0yfq2f";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [ pytestCheckHook ];
 
   pythonImportsCheck = [ "assertpy" ];