diff --git a/src/requirements.txt b/src/requirements.txt
index da72180..80cf1ba 100644
--- a/src/requirements.txt
+++ b/src/requirements.txt
@@ -87,7 +87,7 @@ lazy-object-proxy==1.3.1
 lightgbm==2.2.1
 llvmlite==0.21.0
 locket==0.2.0
-lxml==4.1.1
+lxml==4.9.1
 Mako==1.0.7
 Markdown==2.6.11
 MarkupSafe==1.0