diff --git a/docker/prod/docker-compose.backend.prod.yml b/docker/prod/docker-compose.backend.prod.yml
index 85a0d189..9c56830c 100644
--- a/docker/prod/docker-compose.backend.prod.yml
+++ b/docker/prod/docker-compose.backend.prod.yml
@@ -16,6 +16,7 @@ services:
       - CORS_ORIGIN=http://192.168.0.70:5555,http://39.117.244.52:5555,http://localhost:9771
       - CORS_CREDENTIALS=true
       - LOG_LEVEL=info
+      - ENCRYPTION_KEY=ilshin-plm-mail-encryption-key-32characters-2024-secure
     restart: unless-stopped
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8080/health"]