diff --git a/requirements.txt b/requirements.txt
index b0f20d81c..232b584b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,4 +22,4 @@ 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@21.2.0#egg=notifications-utils==21.2.0
+git+https://github.com/alphagov/notifications-utils.git@21.5.0#egg=notifications-utils==21.5.0