diff --git a/constraints.txt b/constraints.txt
index 1cbe793..b457032 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -11,7 +11,7 @@ dnspython==2.6.1
 eventlet==0.36.1
 Flask==3.0.2
 Flask-Cors==4.0.0
-fonttools==4.50.0
+fonttools==4.51.0
 google-i18n-address==3.1.0
 greenlet==3.0.3
 gunicorn==21.2.0
@@ -44,5 +44,5 @@ wcwidth==0.2.13
 weasyprint==61.2
 webencodings==0.5.1
 Werkzeug==3.0.2
-xml2rfc==3.20.1
+xml2rfc==3.21.0
 zopfli==0.2.3
diff --git a/requirements.txt b/requirements.txt
index 74a4246..505c920 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ requests>=2.31.0
 sentry-sdk[flask]>=1.44.1
 svgcheck>=0.8.0
 weasyprint>=61.2
-xml2rfc>=3.20.1
+xml2rfc>=3.21.0