diff --git a/pkgs/development/python-modules/kajiki/default.nix b/pkgs/development/python-modules/kajiki/default.nix
index e801f49aca4a..e7a0978bb415 100644
--- a/pkgs/development/python-modules/kajiki/default.nix
+++ b/pkgs/development/python-modules/kajiki/default.nix
@@ -6,12 +6,13 @@
   linetable,
   pytestCheckHook,
   pythonOlder,
+  hatchling,
 }:
 
 buildPythonPackage rec {
   pname = "kajiki";
   version = "1.0.1";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
@@ -24,6 +25,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ linetable ];
 
+  build-system = [ hatchling ];
+
   nativeCheckInputs = [
     babel
     pytestCheckHook