diff --git a/pkgs/development/python-modules/baron/default.nix b/pkgs/development/python-modules/baron/default.nix
index 64f7af77b4a0..36421a2d87a5 100644
--- a/pkgs/development/python-modules/baron/default.nix
+++ b/pkgs/development/python-modules/baron/default.nix
@@ -2,6 +2,7 @@
   lib,
   fetchPypi,
   buildPythonPackage,
+  setuptools,
   rply,
   pytestCheckHook,
   isPy3k,
@@ -10,19 +11,25 @@
 buildPythonPackage (finalAttrs: {
   pname = "baron";
   version = "0.10.1";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
     inherit (finalAttrs) pname version;
-    sha256 = "af822ad44d4eb425c8516df4239ac4fdba9fdb398ef77e4924cd7c9b4045bc2f";
+    hash = "sha256-r4Iq1E1OtCXIUW30I5rE/bqf2zmO935JJM18m0BFvC8=";
   };
 
-  propagatedBuildInputs = [ rply ];
+  build-system = [ setuptools ];
+
+  dependencies = [ rply ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
   doCheck = isPy3k;
 
+  pythonImportsCheck = [ "baron" ];
+
   meta = {
     homepage = "https://github.com/PyCQA/baron";
     description = "Abstraction on top of baron, a FST for python to make writing refactoring code a realistic task";