diff --git a/pkgs/development/python-modules/whenever/default.nix b/pkgs/development/python-modules/whenever/default.nix
index 56c642ae5441..d36baeefcba3 100644
--- a/pkgs/development/python-modules/whenever/default.nix
+++ b/pkgs/development/python-modules/whenever/default.nix
@@ -31,18 +31,16 @@ buildPythonPackage rec {
       --replace-fail '--benchmark-disable' '#--benchmark-disable'
   '';
 
-  nativeBuildInputs = [
+  build-system = [
     poetry-core
   ];
 
-  propagatedBuildInputs = [
+  dependencies = [
     tzdata
   ] ++ lib.optionals (pythonOlder "3.9") [
     backports-zoneinfo
   ];
 
-  pythonImportsCheck = [ "whenever" ];
-
   nativeCheckInputs = [
     pytestCheckHook
     pytest-mypy-plugins
@@ -50,6 +48,10 @@ buildPythonPackage rec {
     freezegun
   ];
 
+  pythonImportsCheck = [
+    "whenever"
+  ];
+
   # early TDD, many tests are failing
   # TODO: try enabling on bump
   doCheck = false;