diff --git a/bak/requirements.txt b/bak/requirements.txt
index e71cf59..118eb16 100644
--- a/bak/requirements.txt
+++ b/bak/requirements.txt
@@ -97,7 +97,7 @@ keyrings.alt==3.1
 kiwisolver==1.0.1
 liac-arff==2.3.1
 lockfile==0.12.2
-lxml==4.2.4
+lxml==4.9.1
 Markdown==2.6.11
 MarkupSafe==1.0
 matplotlib==2.2.3