diff --git a/requirements.txt b/requirements.txt
index 0720f1f..f90a986 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ liac-arff==2.4.0
 llvmlite==0.30.0
 lockfile==0.12.2
 louis==3.5.0
-lxml==4.6.3
+lxml==4.9.1
 macaroonbakery==1.1.3
 Mako==1.0.7
 MarkupSafe==1.1.1