diff --git a/pkgs/development/python-modules/pyscss/default.nix b/pkgs/development/python-modules/pyscss/default.nix
index c3731ea6d970..278aa7b1c247 100644
--- a/pkgs/development/python-modules/pyscss/default.nix
+++ b/pkgs/development/python-modules/pyscss/default.nix
@@ -3,24 +3,29 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  setuptools,
   six,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "pyscss";
   version = "1.4.0";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchFromGitHub {
     repo = "pyScss";
     owner = "Kronuz";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-z0y4z+/JE6rZWHAvps/taDZvutyVhxxs2gMujV5rNu4=";
   };
 
-  nativeCheckInputs = [ pytestCheckHook ];
+  build-system = [ setuptools ];
 
-  propagatedBuildInputs = [ six ];
+  dependencies = [ six ];
+
+  nativeCheckInputs = [ pytestCheckHook ];
 
   # Test suite is broken.
   # See https://github.com/Kronuz/pyScss/issues/415
@@ -32,4 +37,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = [ ];
   };
-}
+})