diff --git a/pkgs/by-name/pr/pretalx/package.nix b/pkgs/by-name/pr/pretalx/package.nix
index 4f4a259f02e7..bbfd52c1ad24 100644
--- a/pkgs/by-name/pr/pretalx/package.nix
+++ b/pkgs/by-name/pr/pretalx/package.nix
@@ -1,7 +1,7 @@
 { lib
 , buildNpmPackage
 , gettext
-, python3
+, python311
 , fetchFromGitHub
 , fetchpatch2
 , plugins ? [ ]
@@ -9,7 +9,7 @@
 }:
 
 let
-  python = python3.override {
+  python = python311.override {
     packageOverrides = final: prev: {
       django-bootstrap4 = prev.django-bootstrap4.overridePythonAttrs (oldAttrs: rec {
         version = "3.0.0";
@@ -105,6 +105,7 @@ python.pkgs.buildPythonApplication rec {
     "djangorestframework"
     "markdown"
     "pillow"
+    "publicsuffixlist"
     "python-dateutil"
     "reportlab"
     "requests"