diff --git a/README.en.md b/README.en.md
index b07ed48..bc17d95 100644
--- a/README.en.md
+++ b/README.en.md
@@ -4,10 +4,7 @@ Request and renew free certificates from let's encrypt for Aliyun CDN domains.
 ### Prepare
 Install `certbot` with aliyun DNS plugin and `aliyun-cert`
 ``` shell
-python3 -m venv aliyun-cert
-aliyun-cert/bin/pip install .
-ln -s aliyun-cert/bin/certbot /usr/bin/certbot
-ln -s aliyun-cert/bin/aliyun-cert /usr/bin/aliyun-cert
+pip3 install aliyun-cert
 ```
 
 Create config file `~/.secrets/aliyun.ini` for aliyun access key
diff --git a/README.md b/README.md
index 483a9b1..a1296de 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,9 @@
 
 ### 安装和配置
 
-本脚本仅在 python 3.9 上进行过验证，使用 virtual environment 安装步骤如下：
+本脚本仅支持 Python 3
 ``` shell
-python3 -m venv aliyun-cert
-aliyun-cert/bin/pip install .
-ln -s aliyun-cert/bin/certbot /usr/bin/certbot
-ln -s aliyun-cert/bin/aliyun-cert /usr/bin/aliyun-cert
+pip install aliyun-cert
 ```
 
 需要配置阿里云 ram 账号的 access key，并至少赋予用户如下权限：