diff --git a/pkgs/development/python-modules/ukkonen/default.nix b/pkgs/development/python-modules/ukkonen/default.nix
index a4b88fd70cf9..e3364ea5752d 100644
--- a/pkgs/development/python-modules/ukkonen/default.nix
+++ b/pkgs/development/python-modules/ukkonen/default.nix
@@ -4,21 +4,27 @@
   fetchFromGitHub,
   cffi,
   pytestCheckHook,
+  setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "ukkonen";
   version = "1.1.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "asottile";
     repo = "ukkonen";
-    rev = "v${version}";
-    sha256 = "sha256-vXyOLAiY92Df7g57quiSnOz8yhaIsm8MTB6Fbiv6axQ=";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-vXyOLAiY92Df7g57quiSnOz8yhaIsm8MTB6Fbiv6axQ=";
   };
 
-  nativeBuildInputs = [ cffi ];
+  build-system = [
+    cffi
+    setuptools
+  ];
+
+  dependencies = [ cffi ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
@@ -30,4 +36,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})