diff --git a/requirements.txt b/requirements.txt
index 723d168df..3e55a74b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,4 +22,4 @@ statsd==3.2.1
 git+https://github.com/alphagov/notifications-python-client.git@1.0.0#egg=notifications-python-client==1.0.0
 
 
-git+https://github.com/alphagov/notifications-utils.git@5.2.3#egg=notifications-utils==5.2.3
+git+https://github.com/alphagov/notifications-utils.git@5.2.6#egg=notifications-utils==5.2.6