diff --git a/requirements.txt b/requirements.txt
index d2f2628..9c0c06a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@ mod-wsgi==4.6.8
 Django>=2.2.27
 
 
-lxml==4.6.5
+lxml==4.9.1
 urllib3>=1.26.5
 suds-py3>=1.3.4.0
 biopython==1.72