diff --git a/requirements.txt b/requirements.txt
index cbe44aa3..6e7fd499 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -88,7 +88,7 @@ lazy-object-proxy==1.3.1
 leveldb==0.20
 llvmlite==0.23.1
 locket==0.2.0
-lxml==4.2.1
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==3.0.3