diff --git a/requirements.txt b/requirements.txt
index 2451752..536340f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -81,7 +81,7 @@ lazy-object-proxy==1.3.1
 libarchive-c==2.8
 llvmlite==0.28.0
 locket==0.2.0
-lxml==4.3.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.0.3
 mccabe==0.6.1