diff --git a/requirements.txt b/requirements.txt
index a13bc8d0b..06607be0e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -79,7 +79,7 @@ pyppeteerstealth>=0.0.4
 # Include pytest, so if theres a support issue we can ask them to run these tests on their setup
 pytest ~=7.2
 pytest-flask ~=1.2
-
+aiosmtpd # Used for the built in test smtpd, otherwise not needed
 # Pin jsonschema version to prevent build errors on armv6 while rpds-py wheels aren't available (1708)
 jsonschema==4.17.3