diff --git a/requirements.txt b/requirements.txt
index 4bd77fa..b9db1a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ mod-wsgi==4.6.8
 Django==2.1.*
 
 
-lxml==4.2.5
+lxml==4.6.3
 suds-py3==1.3.4.0
 biopython==1.72