diff --git a/requirements.txt b/requirements.txt
index 3ffdfb572..dba7c2cfc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,6 +20,6 @@ statsd==3.2.1
 
 git+https://github.com/alphagov/notifications-python-client.git@1.3.0#egg=notifications-python-client==1.3.0
 
-git+https://github.com/alphagov/notifications-utils.git@9.0.5#egg=notifications-utils==9.0.5
+git+https://github.com/alphagov/notifications-utils.git@9.1.1#egg=notifications-utils==9.1.1
 
 git+https://github.com/alphagov/boto.git@2.42.0-patch2#egg=boto==2.42.0-patch2