diff --git a/requirements.txt b/requirements.txt
index abdedbd..b506f0a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -70,7 +70,7 @@ jupyter-core==4.1.0
 Lasagne==0.1
 llvmlite==0.9.0
 locket==0.2.0
-lxml==3.6.0
+lxml==4.6.3
 MarkupSafe==0.23
 matplotlib==1.5.1
 mistune==0.7.2