diff --git a/requirements.txt b/requirements.txt
index 5306153..1b5f7fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ idna==2.9
 incremental==17.5.0
 itsdangerous==1.1.0
 Jinja2==2.11.3
-lxml==4.6.3
+lxml==4.9.1
 MarkupSafe==1.1.1
 numpy==1.18.5
 oauthlib==3.1.0