diff --git a/acme/acme.sh b/acme/acme.sh
index 1033407..0966b2f 100755
--- a/acme/acme.sh
+++ b/acme/acme.sh
@@ -22,6 +22,8 @@ acme (){
     cp /acme.sh/${DOMAIN}/fullchain.cer /ssl/${DOMAIN}.cer
     cp /acme.sh/${DOMAIN}/${DOMAIN}.key /ssl/${DOMAIN}.key
     mv /acme.sh/${DOMAIN} /acme.sh/${DOMAIN}-$(date +%Y)-$(date +%m)-$(date +%d)-${RANDOM}
+    rm -rf /acme.sh/ca
+    rm -rf /acme.sh/http.header
 }
 
 if [ ! -n "${DOMAIN}" ] ; then
@@ -31,5 +33,5 @@ else
 fi
 
 cat >/var/spool/cron/crontabs/root<<EOF
-0 0 1 * * /conf/acme.sh >/dev/null 2>&1
+0 0 3 * * /conf/acme.sh >/dev/null 2>&1
 EOF
diff --git a/acme/start.sh b/acme/start.sh
index 5f69d0a..5da613c 100755
--- a/acme/start.sh
+++ b/acme/start.sh
@@ -14,7 +14,7 @@ DOMAIN=$(cat /conf/account.conf | awk -F= '{if($1~"DOMAIN")print $2}')
 DNSAPI=$(cat /conf/account.conf | awk -F= '{if($1~"DNSAPI")print $2}')
 
 cat >/var/spool/cron/crontabs/root<<EOF
-0 0 1 * * /conf/acme.sh >/dev/null 2>&1
+0 0 3 * * /conf/acme.sh >/dev/null 2>&1
 EOF
 
 if [ ! -f "/ssl/${DOMAIN}.cer" ] && [ -n "${DOMAIN}" ]; then
diff --git a/install.sh b/install.sh
index 226d635..fb32177 100644
--- a/install.sh
+++ b/install.sh
@@ -361,6 +361,11 @@ if ! type docker-compose >/dev/null 2>&1 ; then
     exit 0
 fi
 
+if ! type git >/dev/null 2>&1 ; then
+    echo -e "${Red}本机未安装 git 已退出脚本.${Font}"
+    exit
+fi
+
 if [ -d "${WORK_PATH}/rssforever" ] ; then
     echo -e "${Green}当前目录存在 rssforever 项目.请更换目录,或删除后再次执行脚本.${Font}"
     exit 0