diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index f3582c1b7fb5a..4674812339ae3 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -96,6 +96,7 @@ python.pkgs.buildPythonApplication rec {
     "pillow"
     "python-dateutil"
     "reportlab"
+    "rules"
   ];
 
   propagatedBuildInputs = with python.pkgs; [
diff --git a/pkgs/development/python-modules/rules/default.nix b/pkgs/development/python-modules/rules/default.nix
index 3563b76affe75..cc153e44c6f3c 100644
--- a/pkgs/development/python-modules/rules/default.nix
+++ b/pkgs/development/python-modules/rules/default.nix
@@ -2,6 +2,9 @@
 , buildPythonPackage
 , fetchFromGitHub
 
+# build-system
+, setuptools
+
 # tests
 , django
 , djangorestframework
@@ -10,16 +13,20 @@
 
 buildPythonPackage rec {
   pname = "rules";
-  version = "3.3.0";
-  format = "setuptools";
+  version = "3.4.0";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "dfunckt";
     repo = "django-rules";
     rev = "v${version}";
-    hash = "sha256-UFRfRwcvxEn0fD3ScJJ7f/EHd93BOpY3cEF9QDryJZY=";
+    hash = "sha256-fxLaxjni+0S59vtvKBduR0pYMwJWWBPzR5mnH+j6gVE=";
   };
 
+  build-system = [
+    setuptools
+  ];
+
   pythonImportsCheck = [
     "rules"
   ];