diff --git a/requirements.txt b/requirements.txt
index 8c04173..d2eae86 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ javasphinx==0.9.15
 Jinja2==2.10
 kaybee==0.1.19
 lazy-object-proxy==1.3.1
-lxml==4.6.5
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 packaging==19.0