diff --git a/pkgs/development/python-modules/frelatage/default.nix b/pkgs/development/python-modules/frelatage/default.nix
index 3f8d64f9e464c..be04e82e7aa63 100644
--- a/pkgs/development/python-modules/frelatage/default.nix
+++ b/pkgs/development/python-modules/frelatage/default.nix
@@ -23,9 +23,11 @@ buildPythonPackage rec {
     hash = "sha256-eHVqp6govBV9FvSQyaZuEEImHQRs/mbLaW86RCvtDbM=";
   };
 
-  nativeBuildInputs = [ poetry-core ];
+  pythonRelaxDeps = [ "numpy" ];
 
-  propagatedBuildInputs = [
+  build-system = [ poetry-core ];
+
+  dependencies = [
     numpy
     timeout-decorator
   ];