diff --git a/requirements_pip.txt b/requirements_pip.txt
index c7061ac..a9c1645 100644
--- a/requirements_pip.txt
+++ b/requirements_pip.txt
@@ -45,7 +45,7 @@ keyring==16.0.0
 kiwisolver==1.0.1
 lazy-object-proxy==1.3.1
 llvmlite==0.25.0
-lxml==4.2.5
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==1.1.0
 matplotlib==3.0.1