diff --git a/tei2json/requirements.txt b/tei2json/requirements.txt
index dbb06c7..2b7dede 100644
--- a/tei2json/requirements.txt
+++ b/tei2json/requirements.txt
@@ -42,7 +42,7 @@ jupyter-console==6.1.0
 jupyter-core==4.6.3
 jupyterlab==2.1.1
 jupyterlab-server==1.1.1
-lxml==4.5.0
+lxml==4.6.5
 MarkupSafe==1.1.1
 mistune==0.8.4
 nbconvert==5.6.1