diff --git a/requirements.txt b/requirements.txt
index d23c255..a8a8776 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -89,7 +89,7 @@ lazy-object-proxy==1.3.1
 libarchive-c==2.8
 llvmlite==0.26.0
 locket==0.2.0
-lxml==4.3.0
+lxml==4.9.1
 Markdown==3.0.1
 MarkupSafe==1.1.0
 matplotlib==3.0.2