diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 7ff42db5..c4e4170f
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ isort==4.3.4
 jaraco.functools==2.0
 jedi==0.13.2
 lazy-object-proxy==1.3.1
-lxml==4.3.2
+lxml==4.9.1
 mccabe==0.6.1
 more-itertools==6.0.0
 parso==0.3.1