diff --git a/requirements_dev.txt b/requirements_dev.txt
index ecf70e1..8c13865 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -2,7 +2,7 @@ Sphinx==4.3.1
 black==21.12b0
 coverage==6.2
 flake8==4.0.1
-lxml==4.6.5
+lxml==4.7.1
 mypy==0.910
 pylint==2.12.2
 pytest==6.2.5