diff --git a/pkgs/development/python-modules/asdf-transform-schemas/default.nix b/pkgs/development/python-modules/asdf-transform-schemas/default.nix
index 683b1760d0d0..f913e7e429b7 100644
--- a/pkgs/development/python-modules/asdf-transform-schemas/default.nix
+++ b/pkgs/development/python-modules/asdf-transform-schemas/default.nix
@@ -3,25 +3,23 @@
   asdf-standard,
   buildPythonPackage,
   fetchPypi,
-  importlib-resources,
-  pythonOlder,
   setuptools-scm,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "asdf-transform-schemas";
   version = "0.6.0";
   pyproject = true;
 
   src = fetchPypi {
     pname = "asdf_transform_schemas";
-    inherit version;
+    inherit (finalAttrs) version;
     hash = "sha256-D1D44Jb//S0UucgplZASZu8lsj0N/8MK1Bu6RoUalzI=";
   };
 
   build-system = [ setuptools-scm ];
 
-  dependencies = [ asdf-standard ] ++ lib.optionals (pythonOlder "3.9") [ importlib-resources ];
+  dependencies = [ asdf-standard ];
 
   # Circular dependency on asdf
   doCheck = false;
@@ -31,8 +29,8 @@ buildPythonPackage rec {
   meta = {
     description = "ASDF schemas for validating transform tags";
     homepage = "https://github.com/asdf-format/asdf-transform-schemas";
-    changelog = "https://github.com/asdf-format/asdf-transform-schemas/releases/tag/${version}";
+    changelog = "https://github.com/asdf-format/asdf-transform-schemas/releases/tag/${finalAttrs.version}";
     license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})