diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 5270dc41..77b1f09a
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ jupyterlab==0.31.12
 jupyterlab-launcher==0.10.5
 kombu==4.1.0
 labkey==0.6.0
-lxml==4.2.1
+lxml==4.9.1
 MarkupSafe==1.0
 mistune==0.8.3
 msgpack-python==0.5.1