diff --git a/setup.py b/setup.py
index 9a82130..7d578da 100644
--- a/setup.py
+++ b/setup.py
@@ -47,7 +47,7 @@ def read(fname):
     install_requires=[
         'Sickle==0.6.3',
         'argparse==1.2.1',
-        'lxml==3.3.5',
+        'lxml==4.9.1',
         'requests==2.20.0',
         'solrpy==0.9.7',
         'pysolr==3.3.0',