diff --git a/pkgs/development/python-modules/easygui/default.nix b/pkgs/development/python-modules/easygui/default.nix
index f8eabbbf1fc2..ffd99c3a4f33 100644
--- a/pkgs/development/python-modules/easygui/default.nix
+++ b/pkgs/development/python-modules/easygui/default.nix
@@ -2,20 +2,25 @@
   lib,
   fetchPypi,
   buildPythonPackage,
+  setuptools,
   tkinter,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "easygui";
   version = "0.98.3";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchPypi {
-    inherit pname version;
+    inherit (finalAttrs) pname version;
     hash = "sha256-1lP/ee4fQvY7WgkPL5jOAjNdhq2JY7POJmGAXK/pmgQ=";
   };
 
-  propagatedBuildInputs = [ tkinter ];
+  build-system = [ setuptools ];
+
+  dependencies = [ tkinter ];
 
   doCheck = false; # No tests available
 
@@ -27,4 +32,4 @@ buildPythonPackage rec {
     license = lib.licenses.bsd3;
     maintainers = [ ];
   };
-}
+})