diff --git a/requirements.txt b/requirements.txt
index c57007a..2fba0c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ greenery==3.1
 indra==1.9.0
 JPype1==0.6.3
 lrparsing==1.0.13
-lxml==4.6.2
+lxml==4.9.1
 matplotlib==2.2.3
 neo4j-driver==1.7.0
 neobolt==1.7.0