diff --git a/requirements.txt b/requirements.txt
index 2f6266e..670af65 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -49,7 +49,7 @@ jinja2==2.11.1
 jmespath==0.9.5
 joblib==0.14.1
 kiwisolver==1.2.0
-lxml==4.3.5
+lxml==4.9.1
 markupsafe==1.1.1
 matplotlib==3.2.1
 mongoengine==0.19.1