diff --git a/docker-compose.yml b/docker-compose.yml
index 9cba911..374ca96 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -98,6 +98,7 @@ services:
       - NEXTCLOUD_USERS_ROOT=${NEXTCLOUD_USERS_ROOT:-/nextcloud-users}
       - NEXTCLOUD_BASE_URL=${NEXTCLOUD_BASE_URL:-}
       - NEXTCLOUD_WEBHOOK_SECRET=${NEXTCLOUD_WEBHOOK_SECRET:-}
+      - SECRET_KEY=${SECRET_KEY:-mulita-dev-secret-change-me}
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
     depends_on:
@@ -162,6 +163,7 @@ services:
       - NEXTCLOUD_USERS_ROOT=${NEXTCLOUD_USERS_ROOT:-/nextcloud-users}
       - NEXTCLOUD_BASE_URL=${NEXTCLOUD_BASE_URL:-}
       - NEXTCLOUD_WEBHOOK_SECRET=${NEXTCLOUD_WEBHOOK_SECRET:-}
+      - SECRET_KEY=${SECRET_KEY:-mulita-dev-secret-change-me}
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
       # NullPool — see app/database.py for rationale.
@@ -223,6 +225,7 @@ services:
       - NEXTCLOUD_USERS_ROOT=${NEXTCLOUD_USERS_ROOT:-/nextcloud-users}
       - NEXTCLOUD_BASE_URL=${NEXTCLOUD_BASE_URL:-}
       - NEXTCLOUD_WEBHOOK_SECRET=${NEXTCLOUD_WEBHOOK_SECRET:-}
+      - SECRET_KEY=${SECRET_KEY:-mulita-dev-secret-change-me}
       - LOG_LEVEL=${LOG_LEVEL:-INFO}
       - TZ=${TZ:-UTC}
       - MULITA_CELERY_WORKER=1