diff --git a/pkgs/development/python-modules/calmjs/default.nix b/pkgs/development/python-modules/calmjs/default.nix
index 68761f6bbc95..17471b936443 100644
--- a/pkgs/development/python-modules/calmjs/default.nix
+++ b/pkgs/development/python-modules/calmjs/default.nix
@@ -5,12 +5,13 @@
   calmjs-types,
   calmjs-parse,
   pytestCheckHook,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "calmjs";
   version = "3.4.4";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
@@ -18,6 +19,10 @@ buildPythonPackage rec {
     extension = "zip";
   };
 
+  build-system = [
+    setuptools
+  ];
+
   propagatedBuildInputs = [
     calmjs-parse
     calmjs-types
@@ -28,6 +33,10 @@ buildPythonPackage rec {
   disabledTests = [
     # spacing changes in argparse output
     "test_integration_choices_in_list"
+    # formatting changes in argparse output
+    "test_sorted_case_insensitivity"
+    "test_sorted_simple_first"
+    "test_sorted_standard"
   ];
 
   # ModuleNotFoundError: No module named 'calmjs.types'