diff --git a/requirements.txt b/requirements.txt
index 7d3501b..51f8cb7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-lxml==4.6.5
+lxml==4.9.1
 requests==2.23.0
 matplotlib==3.1.3
 networkx==2.4