diff --git a/DMAN_MOT/requirements.txt b/DMAN_MOT/requirements.txt
index 7b14196..2997ef3 100644
--- a/DMAN_MOT/requirements.txt
+++ b/DMAN_MOT/requirements.txt
@@ -98,7 +98,7 @@ lief==0.9.0
 linecache2==1.0.0
 llvmlite==0.30.0
 locket==0.2.0
-lxml==4.4.2
+lxml==4.9.1
 Markdown==3.1.1
 MarkupSafe==1.1.1
 matplotlib==2.2.3