diff --git a/requirements.txt b/requirements.txt
index 377f3072..dc48412f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ colorama==0.4.4
 Cython==0.29.24
 idna==3.2
 iniconfig==1.1.1
-lxml==4.6.3
+lxml==4.9.1
 numpy==1.21.2
 packaging==21.0
 Pillow==8.3.2