diff --git a/pkgs/development/python-modules/cart/default.nix b/pkgs/development/python-modules/cart/default.nix
index 90e4517f4e7f..e1735ef501a3 100644
--- a/pkgs/development/python-modules/cart/default.nix
+++ b/pkgs/development/python-modules/cart/default.nix
@@ -4,21 +4,26 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "cart";
   version = "1.2.3";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchFromGitHub {
     owner = "CybercentreCanada";
     repo = "cart";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-oeWeay1Pr9T4oR3XSrwv9hRr/sLTel1Bt6BG6jHXxIA=";
   };
 
-  propagatedBuildInputs = [ pycryptodome ];
+  build-system = [ setuptools ];
+
+  dependencies = [ pycryptodome ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
@@ -30,8 +35,8 @@ buildPythonPackage rec {
     description = "Python module for the CaRT Neutering format";
     mainProgram = "cart";
     homepage = "https://github.com/CybercentreCanada/cart";
-    changelog = "https://github.com/CybercentreCanada/cart/releases/tag/${src.tag}";
+    changelog = "https://github.com/CybercentreCanada/cart/releases/tag/${finalAttrs.src.tag}";
     license = with lib.licenses; [ mit ];
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})