diff --git a/app/delivery/send_to_providers.py b/app/delivery/send_to_providers.py
index 45d35e64d..5ec949fec 100644
--- a/app/delivery/send_to_providers.py
+++ b/app/delivery/send_to_providers.py
@@ -48,13 +48,11 @@ def send_sms_to_provider(notification):
         )
         template_model = dao_get_template_by_id(notification.template_id, notification.template_version)
 
-        sender_has_been_customised = (not service.get_prefix_sms_with_service_name())
-
         template = SMSMessageTemplate(
             template_model.__dict__,
             values=notification.personalisation,
             prefix=service.name,
-            sender=sender_has_been_customised,
+            show_prefix=service.prefix_sms,
         )
 
         if service.research_mode or notification.key_type == KEY_TYPE_TEST:
diff --git a/requirements.txt b/requirements.txt
index 393f2cf20..8d69902c5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -26,6 +26,6 @@ notifications-python-client==4.6.0
 awscli>=1.11,<1.12
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@22.1.0#egg=notifications-utils==22.1.0
+git+https://github.com/alphagov/notifications-utils.git@23.0.1#egg=notifications-utils==23.0.1
 
 git+https://github.com/alphagov/boto.git@2.43.0-patch3#egg=boto==2.43.0-patch3