diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 91649aa..cd834f5
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 dronekit==2.9.2
 dronekit-sitl==3.3.0
 future==0.17.1
-lxml==4.4.1
+lxml==4.6.3
 monotonic==1.5
 pkg-resources==0.0.0
 psutil==5.6.3