diff --git a/requirements.txt b/requirements.txt
index 146378c..ce0f864 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,5 +2,5 @@ twilio==6.35.3
 inflection==0.3.1
 yapf==0.16.2
 jsbeautifier==1.6.14
-lxml==4.2.3
+lxml==4.9.1
 inflection==0.3.1