diff --git a/setup.py b/setup.py
index 20679d4..7fe8b81 100644
--- a/setup.py
+++ b/setup.py
@@ -31,6 +31,7 @@ install_require = [
     'jinja2',
     'juju',
     'juju-wait',
+    'lxml',
     'PyYAML',
     'tenacity',
     'oslo.config',