diff --git a/tests/requirements.txt b/tests/requirements.txt
index f20bd1fcd..33edfc733 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -7,7 +7,7 @@ wheel
 django-ical==1.9.2
 django-paypal==1.1.2
 django-mptt==0.18.0
-django-post-office==3.11.2
+django-post-office==3.11.3
 django-timezone-field==7.2.2
 djangorestframework==3.17.1
 pre-commit==4.6.1