diff --git a/requirements.txt b/requirements.txt
index a9f6b86..ff46731 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ libmf==0.9.2
 lightfm==1.15
 linecache2==1.0.0
 llvmlite==0.31.0
-lxml==4.5.0
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==3.1.1