diff --git a/requirements.txt b/requirements.txt
index 9bcfe8fc..7920a6a4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ glyphsLib==5.1.6
 idna==2.9
 itsdangerous==1.1.0
 Jinja2==2.11.1
-lxml==4.5.0
+lxml==4.9.1
 MarkupSafe==1.1.1
 opentype-sanitizer==8.0.0.post2
 Pillow==7.0.0