diff --git a/docker/update.sh b/docker/update.sh
index cd04e1b..3fc309d 100644
--- a/docker/update.sh
+++ b/docker/update.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 
 set -u
-${ACME_HOME}/acme.sh --set-default-ca --server letsencrypt
 if [ "${ACME_ENABLED:=true}" = "true" ]; then
+  ${ACME_HOME}/acme.sh --set-default-ca --server letsencrypt
   # 使用acme获取/更新证书
   ${ACME_HOME}/acme.sh ${ACME_PARAMS:-}  \
   --force --issue --cert-home ${CERT_HOME} \