diff --git a/README-zh.md b/README-zh.md
index 323e5f6..72cbce3 100644
--- a/README-zh.md
+++ b/README-zh.md
@@ -73,8 +73,8 @@ 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 24.04, 22.04 或者 20.04
-- Debian 12, 11 或者 10
-- CentOS 7 或者 CentOS Stream 9
+- Debian 12 或者 11
+- CentOS Stream 9
 - Rocky Linux 或者 AlmaLinux 9/8
 - Oracle Linux 9, 8 或者 7
 - Amazon Linux 2
diff --git a/README.md b/README.md
index 775d13d..5b14d7b 100644
--- a/README.md
+++ b/README.md
@@ -73,8 +73,8 @@ 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 24.04, 22.04 or 20.04
-- Debian 12, 11 or 10
-- CentOS 7 or CentOS Stream 9
+- Debian 12 or 11
+- CentOS Stream 9
 - Rocky Linux or AlmaLinux 9/8
 - Oracle Linux 9, 8 or 7
 - Amazon Linux 2
diff --git a/docs/bbr-zh.md b/docs/bbr-zh.md
index 5c0f55f..caea7f3 100644
--- a/docs/bbr-zh.md
+++ b/docs/bbr-zh.md
@@ -12,7 +12,7 @@ Google BBR已经被内置于Linux内核4.9及更高版本中，但是需要手
 
 可以通过命令 `uname -r` 来查看当前Linux内核版本。版本大于等于4.9时，可以直接参照[下方的说明](#部署-google-bbr)部署BBR。
 
-通常而言，Ubuntu 18.04+, Debian 10+，CentOS 8+及RHEL 8+的内核版本都大于4.9。但是对于CentOS 7或者Amazon Linux 2，需要通过以下的方式更新内核之后才能部署Google BBR。
+通常而言，Ubuntu 18.04+, Debian 10+，CentOS 8+及RHEL 8+的内核版本都大于4.9。但是对于Amazon Linux 2，需要通过以下的方式更新内核之后才能部署Google BBR。
 
 ### Amazon Linux 2
 
@@ -35,47 +35,6 @@ Amazon Linux 2提供过经过验证的新版Linux内核，并可以通过启用
    uname -r
    ```
 
-### CentOS 7
-
-当使用CentOS 7时，需要安装由ELRepo Project提供的新版Linux内核。可以在[这个页面](http://elrepo.org/tiki/kernel-ml)找到有关ELRepo Project提供的Linux内核的更多信息。
-
-参见下面的安装说明。
-
-1. 导入ELRepo Project的公钥。
-   ```bash
-   sudo rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
-   ```
-2. 为 RHEL-7、SL-7 或 CentOS-7 安装 ELRepo。
-   ```bash
-   sudo yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
-   ```
-3. 安装 `kernel-ml`。
-   ```bash
-   sudo yum --enablerepo=elrepo-kernel install kernel-ml
-   ```
-4. 确认结果。
-   ```bash
-   rpm -qa | grep kernel
-   ```
-   你应该在输出中看到 `kernel-ml-xxx`。
-5. 显示 grub2 菜单中的所有条目并设置 `kernel-ml`。
-   ```bash
-   sudo egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'
-   ```
-   **索引从 `0` 开始。**   
-   例如，当 `kernel-ml` 位于 `1` 时，使用下面的命令来激活 `kernel-ml`。
-   ```bash
-   sudo grub2-set-default 1
-   ```
-6. 重启。
-   ```bash
-   sudo reboot
-   ```
-7. 检查 Linux 内核版本。
-   ```bash
-   uname -r
-   ```
-
 ## 部署 Google BBR
 
 在这个部分，我们将通过修改配置文件启动Google BBR。
diff --git a/docs/bbr.md b/docs/bbr.md
index 39ab692..7fec2ca 100644
--- a/docs/bbr.md
+++ b/docs/bbr.md
@@ -12,7 +12,7 @@ To learn more about the Google BBR algorithm, see this [official blog](https://c
 
 You can check the current Linux kernel version with the command `uname -r`. When the version is greater than or equal to 4.9, you can deploy BBR directly by referring to the [instructions below](#deploy-google-bbr).
 
-Generally speaking, the kernel versions of Ubuntu 18.04+, Debian 10+, CentOS 8+ and RHEL 8+ are greater than 4.9. But for CentOS 7 or Amazon Linux 2, you need to update the kernel in the following ways before deploying Google BBR.
+Generally speaking, the kernel versions of Ubuntu 18.04+, Debian 10+, CentOS 8+ and RHEL 8+ are greater than 4.9. But for Amazon Linux 2, you need to update the kernel in the following ways before deploying Google BBR.
 
 ### Amazon Linux 2
 
@@ -35,47 +35,6 @@ Amazon Linux 2 provides newer versions of the verified Linux kernel, which can b
    uname -r
    ```
 
-### CentOS 7
-
-When using CentOS 7, a newer Linux kernel provided by the ELRepo Project needs to be installed. More information about the Linux kernels provided by the ELRepo Project can be found at [this page](http://elrepo.org/tiki/kernel-ml).
-
-Refer to the installation instructions below.
-
-1. Import ELRepo Project's public key.
-   ```bash
-   sudo rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
-   ```
-2. Install ELRepo for RHEL-7, SL-7 or CentOS-7.
-   ```bash
-   sudo yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
-   ```
-3. Install `kernel-ml`.
-   ```bash
-   sudo yum --enablerepo=elrepo-kernel install kernel-ml
-   ```
-4. Confirm the result.
-   ```bash
-   rpm -qa | grep kernel
-   ```
-   You should see `kernel-ml-xxx` in output.
-5. Show all entries in the grub2 menu and setup `kernel-ml`.
-   ```bash
-   sudo egrep ^menuentry /etc/grub2.cfg | cut -f 2 -d \'
-   ```
-   **Indexing starts at `0`.**   
-   For example, when the `kernel-ml` is located at `1`, use the command below to activate `kernel-ml`.
-   ```bash
-   sudo grub2-set-default 1
-   ```
-6. Reboot.
-   ```bash
-   sudo reboot
-   ```
-7. Check Linux kernel version.
-   ```bash
-   uname -r
-   ```
-
 ## Deploy Google BBR
 
 In this section, we will start Google BBR by modifying the configuration file.