diff --git a/requirements.txt b/requirements.txt
index 29f60f8..6a1343e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ jupyter-core==4.6.1
 kuriyama==0.3.2
 Logbook==1.5.3
 logzero==1.5.0
-lxml==4.4.2
+lxml==4.6.5
 MarkupSafe==1.1.1
 mistune==0.8.4
 more-itertools==8.1.0