diff --git a/requirements.txt b/requirements.txt
index 8abdf5a..8b034fb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 future==0.18.2
-lxml==4.5.1
+lxml==4.9.1
 pymavlink==2.4.8
 pyserial==3.4