diff --git a/pkgs/development/python-modules/certvalidator/default.nix b/pkgs/development/python-modules/certvalidator/default.nix
index 76580bff70c5..a9d025b199c0 100644
--- a/pkgs/development/python-modules/certvalidator/default.nix
+++ b/pkgs/development/python-modules/certvalidator/default.nix
@@ -2,6 +2,7 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  setuptools,
   asn1crypto,
   oscrypto,
   cacert,
@@ -10,7 +11,7 @@
 buildPythonPackage rec {
   pname = "certvalidator";
   version = "0.11.1";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "wbond";
@@ -19,7 +20,9 @@ buildPythonPackage rec {
     hash = "sha256-yVF7t4FuU3C9fDg67JeM7LWZZh/mv5F4EKmjlO4AuBY=";
   };
 
-  propagatedBuildInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     asn1crypto
     oscrypto
   ];