diff --git a/README-zh.md b/README-zh.md
index 629ecdc..2ac4da6 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -72,7 +72,7 @@ https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/vpnsetup.sh
 
 一个云服务器，虚拟专用服务器 (VPS) 或者专用服务器，安装以下操作系统之一：
 
-- Ubuntu 22.04, 20.04 或者 18.04
+- Ubuntu 22.04 或者 20.04
 - Debian 11 或者 10
 - CentOS 7 或者 CentOS Stream 9/8
 - Rocky Linux 或者 AlmaLinux 9/8
@@ -315,7 +315,7 @@ https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/extras/vpnupgrade.sh
 如果无法下载，打开 [vpnupgrade.sh](extras/vpnupgrade.sh)，然后点击右边的 `Raw` 按钮。按快捷键 `Ctrl/Cmd+A` 全选，`Ctrl/Cmd+C` 复制，然后粘贴到你喜欢的编辑器。
 </details>
 
-当前支持的 Libreswan 最新版本是 `4.10`。查看已安装版本：`ipsec --version`。
+当前支持的 Libreswan 最新版本是 `4.11`。查看已安装版本：`ipsec --version`。
 
 **注：** `xl2tpd` 可以使用系统的软件包管理器进行更新，例如 Ubuntu/Debian 上的 `apt-get`。
 
diff --git a/README.md b/README.md
index 1f7e6f6..7c36922 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ A pre-built [Docker image](https://github.com/hwdsl2/docker-ipsec-vpn-server) is
 
 A cloud server, virtual private server (VPS) or dedicated server, with an install of:
 
-- Ubuntu 22.04, 20.04 or 18.04
+- Ubuntu 22.04 or 20.04
 - Debian 11 or 10
 - CentOS 7 or CentOS Stream 9/8
 - Rocky Linux or AlmaLinux 9/8
@@ -315,7 +315,7 @@ https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/extras/vpnupgrade.sh
 If you are unable to download, open [vpnupgrade.sh](extras/vpnupgrade.sh), then click the `Raw` button on the right. Press `Ctrl/Cmd+A` to select all, `Ctrl/Cmd+C` to copy, then paste into your favorite editor.
 </details>
 
-The latest supported Libreswan version is `4.10`. Check installed version: `ipsec --version`.
+The latest supported Libreswan version is `4.11`. Check installed version: `ipsec --version`.
 
 **Note:** `xl2tpd` can be updated using your system's package manager, such as `apt-get` on Ubuntu/Debian.
 
diff --git a/azure/README-zh.md b/azure/README-zh.md
index 82d3664..c27dc31 100644
--- a/azure/README-zh.md
+++ b/azure/README-zh.md
@@ -9,7 +9,7 @@
  - Username for VPN **and** SSH （用户名）
  - Password for VPN **and** SSH （密码）
  - IPsec Pre-Shared Key for VPN （IPsec 预共享密钥）
- - Operating System Image （操作系统镜像，Ubuntu 22.04, 20.04 或 18.04）
+ - Operating System Image （操作系统镜像，Ubuntu 22.04 或 20.04）
  - Virtual Machine Size （虚拟机大小，默认值： Standard_B1s）
 
 **注：** \*不要\* 在值中使用这些字符： `\ " '`
diff --git a/azure/README.md b/azure/README.md
index f9d0ca6..83fa707 100644
--- a/azure/README.md
+++ b/azure/README.md
@@ -9,7 +9,7 @@ Customizable with the following options:
  - Username for VPN **and** SSH
  - Password for VPN **and** SSH
  - IPsec Pre-Shared Key for VPN
- - Operating System Image (Ubuntu 22.04, 20.04 or 18.04)
+ - Operating System Image (Ubuntu 22.04 or 20.04)
  - Virtual Machine Size (Default: Standard_B1s)
 
 **Note:** DO NOT use these special characters within values: `\ " '`