diff --git a/ros/wf5/requirements.txt b/ros/wf5/requirements.txt
index 467acc1..61e14a6 100644
--- a/ros/wf5/requirements.txt
+++ b/ros/wf5/requirements.txt
@@ -38,7 +38,7 @@ jsonpath-rw==1.4.0
 jsonschema==2.6.0
 lockfile==0.12.2
 lru-dict==1.1.6
-lxml==4.3.0
+lxml==4.6.5
 MarkupSafe==1.1.0
 mistune==0.8.4
 more-itertools==4.3.0