diff --git a/requirements.txt b/requirements.txt
index 258665d..2424b68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ Flask==3.1.3
 idna==2.7
 itsdangerous==0.24
 Jinja2==3.1.6
-lxml==4.3.2
+lxml==4.9.1
 Markdown==3.10.2
 MarkupSafe==1.0
 numpy==1.15.4