diff --git a/DEVELOPER.md b/DEVELOPER.md
index f9e184dc..1503cc4a 100644
--- a/DEVELOPER.md
+++ b/DEVELOPER.md
@@ -471,17 +471,17 @@ The software we depend on:
     * Redis, `apt-get install -y redis`
     * Nginx, `apt-get install -y nginx`
         * SSL: `mgmt/containers/ssl`
-* [Certbot](https://github.com/ossrs/srs/issues/2864#lets-encrypt), `docker --name certbot`
+* [LEGO](https://github.com/go-acme/lego)
     * Verify webroot: `mgmt/containers/www/.well-known/acme-challenge/`
     * Cert files: `mgmt/containers/etc/letsencrypt/live/`
-* [SRS](https://github.com/ossrs/srs), `docker --name srs-server`
+* [SRS](https://github.com/ossrs/srs)
     * Config: `mgmt/containers/conf/srs.conf` mount as `/usr/local/srs/conf/lighthouse.conf`
     * Volume: `mgmt/containers/objs/nginx/html` mount as `/usr/local/srs/objs/nginx/html`
-* [srs-hooks](https://github.com/ossrs/srs-cloud/tree/lighthouse/hooks), `docker --name srs-hooks`
+* [srs-hooks](https://github.com/ossrs/srs-cloud/tree/lighthouse/hooks)
     * Volume: `mgmt/containers/objs/nginx/html` mount as `/usr/local/mgmt/containers/objs/nginx/html`
-* [tencent-cloud](https://github.com/ossrs/srs-cloud/tree/lighthouse/tencent), `docker --name tencent-cloud`
+* [tencent-cloud](https://github.com/ossrs/srs-cloud/tree/lighthouse/tencent)
     * [CAM](https://console.cloud.tencent.com/cam/overview) Authentication by secretId and secretKey.
-* [ffmpeg](https://github.com/ossrs/srs-cloud/tree/lighthouse/ffmpeg), `docker --name ffmpeg`
+* [ffmpeg](https://github.com/ossrs/srs-cloud/tree/lighthouse/ffmpeg)
     * [FFmpeg and ffprobe](https://ffmpeg.org) tools in `ossrs/srs:node-av`
 
 ## Environments
diff --git a/README.md b/README.md
index 81a963ae..d21df381 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ The features that we're developing:
 - [x] [Support aaPanel to install on any linux](https://github.com/ossrs/srs-cloud/issues/29).
 - [x] [Support DVR to local disk](https://github.com/ossrs/srs-cloud/issues/42).
 - [ ] Support upgrade to latest version manually.
-- [ ] Support HTTPS by let's encrypt with certbot.
+- [ ] Support HTTPS by let's encrypt with LEGO.
 - [ ] Support GB28181 by SRS 5.0 container.
 - [ ] Support live streaming transcoding by FFmpeg, see [#2869](https://github.com/ossrs/srs/issues/2869).
 - [ ] Support virtual live streaming, covert file or other resource to live.
diff --git a/focal/Dockerfile b/focal/Dockerfile
index e3535952..82200167 100644
--- a/focal/Dockerfile
+++ b/focal/Dockerfile
@@ -6,11 +6,6 @@ FROM ${ARCH}redis:5.0 AS redis
 # http://releases.ubuntu.com/focal/
 FROM ${ARCH}ubuntu:focal AS dist
 
-# https://serverfault.com/questions/949991/how-to-install-tzdata-on-a-ubuntu-docker-image
-ENV DEBIAN_FRONTEND=noninteractive
-# See https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#apt-get
-RUN apt update && apt-get install -y certbot && rm -rf /var/lib/apt/lists/*
-
 COPY --from=build /usr/local/bin/ffmpeg /usr/local/bin/ffmpeg
 COPY --from=build /usr/local/bin/ffprobe /usr/local/bin/ffprobe
 # For HTTPS client, or failed as: x509: certificate signed by unknown authority