diff --git a/pkgs/development/python-modules/webthing-ws/default.nix b/pkgs/development/python-modules/webthing-ws/default.nix
index ffd378311cf3..73cb50838ccd 100644
--- a/pkgs/development/python-modules/webthing-ws/default.nix
+++ b/pkgs/development/python-modules/webthing-ws/default.nix
@@ -4,12 +4,13 @@
   async-timeout,
   buildPythonPackage,
   fetchFromGitHub,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "webthing-ws";
   version = "0.2.0";
-  format = "setuptools";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "home-assistant-ecosystem";
@@ -18,7 +19,9 @@ buildPythonPackage rec {
     hash = "sha256-j7nc4yJczDs28RVFDHeQ2ZIG9mIW2m25AAeErVKi4E4=";
   };
 
-  propagatedBuildInputs = [
+  build-system = [ setuptools ];
+
+  dependencies = [
     aiohttp
     async-timeout
   ];