diff --git a/requirements.txt b/requirements.txt
index caa27e8..28a14fd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -97,7 +97,7 @@ lazy-object-proxy==1.3.1
 linecache2==1.0.0
 llvmlite==0.24.0
 locket==0.2.0
-lxml==4.2.5
+lxml==4.9.1
 MarkupSafe==1.0
 matplotlib==2.2.4
 mccabe==0.6.1