diff --git a/requirements-dev.txt b/requirements-dev.txt
index 2bb90be..ff02ee9 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -2,7 +2,7 @@
 black==19.3b0
 flake8==3.7.8
 isort==4.3.21
-lxml==4.4.1
+lxml==4.9.1
 mypy==0.720
 pre-commit==1.18.3
 pre-commit-hooks==2.3.0