diff --git a/requirements.txt b/requirements.txt
index 97d168e7..8a48a662 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 beautifulsoup4==4.9.3
 crossref-commons==0.0.7
 jupyter==1.0.0
-lxml==4.9.1
+lxml==6.1.0
 matplotlib==3.4.1
 nbconvert==6.5.1
 numpy==1.22.0