diff --git a/setup.py b/setup.py
index 44a1772..133c427 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ def package_data(pkg, roots):
     ],
     install_requires=[
         'XBlock==1.2.9',
-        'lxml==3.8.0',
+        'lxml==4.9.1',
         'web-fragments==0.2.2',
     ],
     entry_points={