diff --git a/requirements.txt b/requirements.txt
index 6c761f771..dd73379b3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,4 @@ py-gfm==0.1.2
 
 git+https://github.com/alphagov/notifications-python-client.git@0.5.0#egg=notifications-python-client==0.5.0
 
-git+https://github.com/alphagov/notifications-utils.git@4.1.3#egg=notifications-utils==4.1.3
+git+https://github.com/alphagov/notifications-utils.git@4.3.0#egg=notifications-utils==4.3.0