diff --git a/playbooks/ntfy.yml b/playbooks/ntfy.yml
index 9a892e5..89c51f3 100644
--- a/playbooks/ntfy.yml
+++ b/playbooks/ntfy.yml
@@ -41,6 +41,7 @@
                 NTFY_AUTH_FILE: /var/lib/ntfy/auth.db
                 NTFY_AUTH_DEFAULT_ACCESS: deny-all
                 NTFY_ATTACHMENT_CACHE_DIR: /var/cache/ntfy/attachments
+                NTFY_UPSTREAM_BASE_URL: https://ntfy.sh
               volumes:
                 - ntfy-cache:/var/cache/ntfy
                 - ntfy-auth:/var/lib/ntfy