diff --git a/requirements.txt b/requirements.txt
index 6bebed6..1ab8eb6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -80,7 +80,7 @@ librosa==0.5.1
 llvmlite==0.20.0
 locket==0.2.0
 lockfile==0.12.2
-lxml==4.1.1
+lxml==4.9.1
 Mako==1.0.7
 Markdown==2.6.9
 MarkupSafe==1.0