diff --git a/base-requirements.txt b/base-requirements.txt
index 9eb3ab595..4b9032501 100644
--- a/base-requirements.txt
+++ b/base-requirements.txt
@@ -9,7 +9,7 @@ Pillow==5.1.0
 psycopg2==2.7.3.2
 python3-openid==3.1.0
 # lxml used by BeautifulSoup.
-lxml==4.1.1
+lxml==4.9.1
 cssselect==0.9.1
 feedparser==5.2.1
 beautifulsoup4==4.6.0