diff --git a/requirements.txt b/requirements.txt
index e47996c..24c8f0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ mod-wsgi==4.6.8
 django>=2.2.13
 
 
-lxml==4.2.5
+lxml==4.9.1
 urllib3>=1.25.9
 suds-py3==1.3.4.0
 biopython==1.72