diff --git a/requirements.txt b/requirements.txt
index db49ed2..ebd1908 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-lxml==4.3.0
+lxml==4.9.1
 numpy==1.16.0
 opencv-contrib-python==3.4.9.33
 tqdm==4.29.1