diff --git a/requirements.txt b/requirements.txt
index 1dc8b4d..7788559 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ jupyter-core==4.4.0
 keyring==10.6.0
 keyrings.alt==3.0
 kiwisolver==1.0.1
-lxml==4.2.1
+lxml==4.6.3
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.2.3