diff --git a/requirements.txt b/requirements.txt
index 726af8056..362858d7b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,4 +20,4 @@ notifications-python-client==4.7.1
 awscli==1.14.22
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@23.5.0#egg=notifications-utils==23.5.0
+git+https://github.com/alphagov/notifications-utils.git@23.5.1#egg=notifications-utils==23.5.1