diff --git a/stack.yml b/stack.yml
index 0cd6f95..64f9b35 100644
--- a/stack.yml
+++ b/stack.yml
@@ -23,6 +23,7 @@ services:
       # URLs públicas do app (evita fallback para localhost)
       NEXT_PUBLIC_APP_URL: "${NEXT_PUBLIC_APP_URL}"
       BETTER_AUTH_URL: "${BETTER_AUTH_URL}"
+      BETTER_AUTH_SECRET: "${BETTER_AUTH_SECRET}"
       # Mantém o SQLite fora do repositório
       DATABASE_URL: "file:/app/data/db.sqlite"
       # Usado para forçar novo rollout a cada deploy (setado pelo CI)