diff --git a/requirements.txt b/requirements.txt
index 8187c1cebf..88b78e665b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,5 +71,5 @@ tqdm>=4.64.0
 Unidecode>=1.3.4
 urllib3>=2
 weasyprint>=59
-xml2rfc>=3.12.4
+xml2rfc[pdf]>=3.23.0
 xym>=0.6,<1.0