diff --git a/requirements.txt b/requirements.txt
index 0a42fbb..f75dda0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ idna==2.8
 imagesize==1.1.0
 instrumented-soap==2.1.1
 Jinja2==2.10.1
-lxml==4.3.3
+lxml==4.9.1
 MarkupSafe==1.1.1
 mccabe==0.6.1
 packaging==19.0