diff --git a/setup.py b/setup.py
index 5d0b0a79..beddc3e2 100644
--- a/setup.py
+++ b/setup.py
@@ -81,7 +81,7 @@
             'mock==0.8',
             'ndg-xacml==0.5.1',
             'python-gevent-profiler',
-            'lxml==2.3.4',
+            'lxml==4.9.1',
             'requests',
             'psutil==1.0.1'
         ],