diff --git a/build/requirements.txt b/build/requirements.txt
index 6484236c..c959dd8d 100644
--- a/build/requirements.txt
+++ b/build/requirements.txt
@@ -28,7 +28,7 @@ django-contrib-comments<1.9.0
 feedparser==5.1.3
 importlib==1.0.3
 # if it fails, try 'sudo apt-get install libxml2-dev libxslt1-dev python-dev', then run again
-lxml==3.4.0
+lxml==4.9.1
 # if it fails, try 'sudo apt-get install libpq-dev', then run again
 psycopg2-binary