diff --git a/pyConv/requirements.txt b/pyConv/requirements.txt
index a5cf5ca..0efdd2c 100644
--- a/pyConv/requirements.txt
+++ b/pyConv/requirements.txt
@@ -40,7 +40,7 @@ jupyter-client==6.1.12
 jupyter-core==4.7.1
 jupyterlab-pygments==0.1.2
 jupyterlab-widgets==1.0.0
-lxml==4.6.3
+lxml==4.9.1
 MarkupPy==1.14
 MarkupSafe==2.0.1
 matplotlib-inline==0.1.2