diff --git a/install/install_docker.sh b/install/install_docker.sh
index d35bbc53..334c1334 100644
--- a/install/install_docker.sh
+++ b/install/install_docker.sh
@@ -105,8 +105,8 @@ if docker_exist; then
 else
     local mirrors=("Official" "Official" "AzureChinaCloud" "Aliyun")
     local urls=("https://download.docker.com/linux/centos/docker-ce.repo" "https://download.docker.com/linux/centos/docker-ce.repo" "https://mirror.azure.cn/docker-ce/linux/centos/docker-ce.repo" "https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo")
-    local timeout=60
-    local max_retries=${#mirrors[@]}
+    local timeout=180
+    local max_retries=4
     local retry_count=0
 
     while ((retry_count < max_retries)); do
diff --git a/version.json b/version.json
index 1896552f..e99a2ae5 100644
--- a/version.json
+++ b/version.json
@@ -1,5 +1,5 @@
 {
-  "version": "0.8.29-rc3",
+  "version": "0.8.29-rc4",
   "plugins": {
     "portainer": "0.0.7",
     "nginx": "0.0.5",