diff --git a/requirements.txt b/requirements.txt
index da23cebf5..0b1bd52a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,4 +26,4 @@ notifications-python-client==4.4.0
 awscli>=1.11,<1.12
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@19.0.4#egg=notifications-utils==19.0.4
+git+https://github.com/alphagov/notifications-utils.git@21.0.0#egg=notifications-utils==21.0.0