diff --git a/requirements.txt b/requirements.txt
index 69032c3..f376b69 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -173,7 +173,7 @@ llvmlite==0.31.0
 lmdb==0.98
 lucid==0.3.8
 LunarCalendar==0.0.9
-lxml==4.2.6
+lxml==4.9.1
 Markdown==3.2.2
 MarkupSafe==1.1.1
 matplotlib==3.2.1