diff --git a/requirements/base.txt b/requirements/base.txt
index ea0b4770..3181c493 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -13,6 +13,7 @@ django-polymorphic==2.0.3
 django-tables2==2.1.0
 docutils==0.14
 idna==2.8
+lxml==4.5.2
 oauthlib==3.1.0
 phonenumbers==8.12.7
 Pillow==7.1.2