diff --git a/requirements.txt b/requirements.txt
index 2ae3d9a06..083649188 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,7 +26,7 @@ notifications-python-client==4.6.0
 awscli==1.14.4
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@23.2.1#egg=notifications-utils==23.2.1
+git+https://github.com/alphagov/notifications-utils.git@23.2.1#egg=notifications-utils==23.3.1
 
 git+https://github.com/alphagov/boto.git@2.43.0-patch3#egg=boto==2.43.0-patch3