diff --git a/requirements.txt b/requirements.txt
index 337db9c..650c3f9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ httplib2==0.18.1
 idna==2.9
 install==1.3.3
 jsonseq==1.0.0
-lxml==4.5.2
+lxml==4.9.1
 multidict==4.7.5
 numpy==1.19.0
 oauth2client==4.1.3