diff --git a/pkgs/by-name/pr/pretix/package.nix b/pkgs/by-name/pr/pretix/package.nix
index d44f0f5df26c..52f8e728eb21 100644
--- a/pkgs/by-name/pr/pretix/package.nix
+++ b/pkgs/by-name/pr/pretix/package.nix
@@ -83,6 +83,7 @@ python.pkgs.buildPythonApplication rec {
   pythonRelaxDeps = [
     "django-phonenumber-field"
     "dnspython"
+    "drf_ujson2"
     "importlib-metadata"
     "kombu"
     "markdown"