diff --git a/pkgs/development/python-modules/mailchecker/default.nix b/pkgs/development/python-modules/mailchecker/default.nix
index 4701b456e09a..62b97f53b1e8 100644
--- a/pkgs/development/python-modules/mailchecker/default.nix
+++ b/pkgs/development/python-modules/mailchecker/default.nix
@@ -2,20 +2,25 @@
 , buildPythonPackage
 , fetchPypi
 , pythonOlder
+, setuptools
 }:
 
 buildPythonPackage rec {
   pname = "mailchecker";
-  version = "5.0.9";
-  format = "setuptools";
+  version = "6.0.1";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-iwg5B9pC2qRI2T6xnwyXjd4uhWVhel52Jxs1pfcoXM0=";
+    hash = "sha256-PXo6dfiAqC1WD/z5NBI6UZVUl/cwlvoqKDyfZI4fn2s=";
   };
 
+  nativeBuildInputs = [
+    setuptools
+  ];
+
   # Module has no tests
   doCheck = false;