diff --git a/requirements.txt b/requirements.txt
index 05a3af9..fb6d3b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -92,7 +92,7 @@ ktext==0.27
 lazy-object-proxy==1.3.1
 llvmlite==0.20.0
 locket==0.2.0
-lxml==3.8.0
+lxml==4.9.1
 Markdown==2.6.9
 MarkupSafe==1.0
 matplotlib==2.1.0