diff --git a/requirements.txt b/requirements.txt
index af48d6b..a32d458 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -137,7 +137,7 @@ jellyfish==0.2.0
 Jinja2==2.7
 la==0.6.0
 Logbook==0.8.1
-lxml==3.3.5
+lxml==4.6.5
 Mako==0.8.1
 marisa-trie==0.5.1
 Markdown==2.3.1