diff --git a/pkgs/development/python-modules/immutabledict/default.nix b/pkgs/development/python-modules/immutabledict/default.nix
index 0f8426de29ba..222cc3ffabd4 100644
--- a/pkgs/development/python-modules/immutabledict/default.nix
+++ b/pkgs/development/python-modules/immutabledict/default.nix
@@ -4,24 +4,21 @@
   fetchFromGitHub,
   poetry-core,
   pytestCheckHook,
-  pythonOlder,
 }:
 
 buildPythonPackage rec {
   pname = "immutabledict";
-  version = "4.2.1";
-  format = "pyproject";
-
-  disabled = pythonOlder "3.7";
+  version = "4.2.2";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "corenting";
     repo = "immutabledict";
     tag = "v${version}";
-    hash = "sha256-v2oOzvAa8KONZDQuxouai2B9d1RY4kZG/px2wl0KAyM=";
+    hash = "sha256-ymzOSPVe0Z82FAgVIagY9lyNiMiubXjSBnXIEwzwC20=";
   };
 
-  nativeBuildInputs = [ poetry-core ];
+  build-system = [ poetry-core ];
 
   pythonImportsCheck = [ "immutabledict" ];