diff --git a/requirements.txt b/requirements.txt
index c85a343..22a5630 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -86,7 +86,7 @@ lazy-object-proxy==1.4.3
 libarchive-c==2.8
 llvmlite==0.29.0
 locket==0.2.0
-lxml==4.6.2
+lxml==4.9.1
 MarkupSafe==1.1.1
 matplotlib==3.1.0
 mccabe==0.6.1