diff --git a/pkgs/by-name/me/memtree/package.nix b/pkgs/by-name/me/memtree/package.nix
index cac70bde8c6d..a765976f2f3e 100644
--- a/pkgs/by-name/me/memtree/package.nix
+++ b/pkgs/by-name/me/memtree/package.nix
@@ -17,13 +17,11 @@ python3Packages.buildPythonApplication {
     hash = "sha256-gUULox3QSx68x8lb1ytanY36cw/I9L4HdpR8OPOsxuc=";
   };
 
-  pythonRelaxDeps = [ "rich" ];
-
-  nativeBuildInputs = with python3Packages; [
+  build-system = with python3Packages; [
     poetry-core
   ];
 
-  propagatedBuildInputs = with python3Packages; [
+  dependencies = with python3Packages; [
     rich
   ];