diff --git a/requirements.txt b/requirements.txt
index 1f5f47107..ed4678d73 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,6 +28,5 @@ notifications-python-client>=3.1,<3.2
 awscli>=1.11,<1.12
 awscli-cwlogs>=1.4,<1.5
 
-git+https://github.com/alphagov/notifications-utils.git@16.0.1#egg=notifications-utils==16.0.1
-
+git+https://github.com/alphagov/notifications-utils.git@15.0.4#egg=notifications-utils==15.0.4