diff --git a/requirements.txt b/requirements.txt
index 4abdbcb..5fa5f3e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -59,7 +59,7 @@ jupyter-client==4.1.1
 jupyter-console==4.0.3
 jupyter-core==4.0.6
 llvmlite==0.7.0+5.gc591d39
-lxml==3.4.4
+lxml==4.6.3
 Mako==0.9.1
 MarkupSafe==0.18
 matplotlib==1.4.3