diff --git a/requirements.txt b/requirements.txt
index 6b9fd0c54..1240f31af 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,4 +29,4 @@ whitenoise==1.0.6  #manages static assets
 # pin to minor version 3.1.x
 notifications-python-client>=3.1,<3.2
 
-git+https://github.com/alphagov/notifications-utils.git@13.3.1#egg=notifications-utils==13.3.1
+git+https://github.com/alphagov/notifications-utils.git@13.5.0#egg=notifications-utils==13.5.0