diff --git a/pkgs/development/python-modules/in-n-out/default.nix b/pkgs/development/python-modules/in-n-out/default.nix
index 3a5e3287b022..320841f5d4dd 100644
--- a/pkgs/development/python-modules/in-n-out/default.nix
+++ b/pkgs/development/python-modules/in-n-out/default.nix
@@ -3,7 +3,6 @@
   buildPythonPackage,
   cython,
   fetchPypi,
-  future,
   pytestCheckHook,
   pythonAtLeast,
   pythonOlder,
@@ -15,7 +14,7 @@
 buildPythonPackage rec {
   pname = "in-n-out";
   version = "0.2.1";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.8";
 
@@ -25,14 +24,12 @@ buildPythonPackage rec {
     hash = "sha256-Q83it96YHUGm1wYYore9mJSBCVkipT6tTcdfK71d/+o=";
   };
 
-  nativeBuildInputs = [
+  build-system = [
     cython
     hatchling
     hatch-vcs
   ];
 
-  propagatedBuildInputs = [ future ];
-
   nativeCheckInputs = [
     pytestCheckHook
     toolz