diff --git a/requirements.txt b/requirements.txt
index 44fb99c..b066297 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -74,7 +74,7 @@ lazy-object-proxy==1.2.2
 llvmlite==0.18.0
 localconfig==1.0.2
 locket==0.2.0
-lxml==3.7.3
+lxml==4.6.5
 Markdown==2.6.8
 MarkupSafe==0.23
 matplotlib==2.0.2