diff --git a/pkgs/development/python-modules/circuitbreaker/default.nix b/pkgs/development/python-modules/circuitbreaker/default.nix
index 71f4421efbda..f5b7985d8a0c 100644
--- a/pkgs/development/python-modules/circuitbreaker/default.nix
+++ b/pkgs/development/python-modules/circuitbreaker/default.nix
@@ -2,23 +2,28 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
+  setuptools,
   pytestCheckHook,
   pytest-asyncio,
   pytest-mock,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "circuitbreaker";
   version = "2.1.3";
-  format = "setuptools";
+  pyproject = true;
+
+  __structuredAttrs = true;
 
   src = fetchFromGitHub {
     owner = "fabfuel";
     repo = "circuitbreaker";
-    tag = version;
+    tag = finalAttrs.version;
     hash = "sha256-7BpYGhha0PTYzsE9CsN4KxfJW/wm2i6V+uAeamBREBQ=";
   };
 
+  build-system = [ setuptools ];
+
   nativeCheckInputs = [
     pytestCheckHook
     pytest-asyncio
@@ -33,4 +38,4 @@ buildPythonPackage rec {
     license = with lib.licenses; [ bsd3 ];
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})