diff --git a/pkgs/development/python-modules/pyisbn/default.nix b/pkgs/development/python-modules/pyisbn/default.nix
index b8df8ad15a78..fc4b9973c2dd 100644
--- a/pkgs/development/python-modules/pyisbn/default.nix
+++ b/pkgs/development/python-modules/pyisbn/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchPypi,
+  setuptools,
   hypothesis,
   pythonOlder,
   pytestCheckHook,
@@ -11,15 +12,17 @@
 buildPythonPackage rec {
   pname = "pyisbn";
   version = "1.3.1";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "06fm9rn31cb4b61hzy63cnwfjpppgyy517k8a04gzcv9g60n7xbh";
+    hash = "sha256-cPVjgXlps/8IUGieULx/917puGXD+A+DWWSxMGxO1Rk=";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [
     hypothesis
     pytestCheckHook