diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d1d398a41..75b88d5af 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,17 +12,20 @@ jobs:
     runs-on: ubuntu-20.04
 
     steps:
-      ################################################################
+      ##################################################################################################################
+      ##################################################################################################################
+      ##################################################################################################################
       # Git checkout
       - name: Checkout repository
         uses: actions/checkout@v2
-      # The github.ref is, for example, refs/tags/v4.0.145 or refs/tags/v4.0-r8
+
+      # The github.ref is, for example, refs/tags/v5.0.145 or refs/tags/v5.0-r8
       # Generate variables like:
-      #   SRS_TAG=v4.0-r8
-      #   SRS_TAG=v4.0.145
-      #   SRS_VERSION=4.0.145
-      #   SRS_VERSION=4.0-r8
-      #   SRS_MAJOR=4
+      #   SRS_TAG=v5.0-r8
+      #   SRS_TAG=v5.0.145
+      #   SRS_VERSION=5.0.145
+      #   SRS_VERSION=5.0-r8
+      #   SRS_MAJOR=5
       # @see https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable
       - name: Generate varaiables
         run: |
@@ -32,35 +35,7 @@ jobs:
           echo "SRS_VERSION=$SRS_VERSION" >> $GITHUB_ENV
           SRS_MAJOR=$(echo $SRS_TAG| cut -c 2)
           echo "SRS_MAJOR=$SRS_MAJOR" >> $GITHUB_ENV
-      # Create source tar for release. Note that it's for OpenWRT package srs-server, so the filename MUST be
-      # srs-server-xxx.tar.gz, because the package is named srs-server.
-      # Generate variables like:
-      #   SRS_SOURCE_TAR=srs-server-4.0.145.tar.gz
-      #   SRS_SOURCE_MD5=83e38700a80a26e30b2df054e69956e5
-      - name: Create source tar.gz
-        run: |
-          DEST_DIR=srs-server-$SRS_VERSION && mkdir -p $DEST_DIR &&
-          cp README.md $DEST_DIR && cp LICENSE $DEST_DIR && cp -R trunk $DEST_DIR/trunk &&
-          (cd $DEST_DIR/trunk/3rdparty && rm -rf *.zip openssl-*.gz srs-bench) &&
-          tar zcf ${DEST_DIR}.tar.gz ${DEST_DIR} && du -sh ${DEST_DIR}* && rm -rf ${DEST_DIR} &&
-          echo "SRS_SOURCE_TAR=${DEST_DIR}.tar.gz" >> $GITHUB_ENV &&
-          echo "SRS_SOURCE_MD5=$(md5sum ${DEST_DIR}.tar.gz| awk '{print $1}')" >> $GITHUB_ENV
-      # Create package tar for release
-      # Generate variables like:
-      #   SRS_PACKAGE_ZIP=SRS-CentOS7-x86_64-4.0.145.zip
-      #   SRS_PACKAGE_MD5=3880a26e30b283edf05700a4e69956e5
-      - name: Create package zip
-        env:
-          PACKAGER: ${{ secrets.SRS_PACKAGER_BINARY }}
-        run: |
-          docker build --tag srs:pkg --build-arg version=$SRS_VERSION --build-arg SRS_AUTO_PACKAGER=$PACKAGER -f trunk/Dockerfile.pkg . &&
-          SRS_PACKAGE_ZIP=SRS-CentOS7-x86_64-$SRS_VERSION.zip &&
-          docker run --rm -v $(pwd):/output srs:pkg cp objs/$SRS_PACKAGE_ZIP /output/ &&
-          du -sh $SRS_PACKAGE_ZIP &&
-          echo "SRS_PACKAGE_ZIP=$SRS_PACKAGE_ZIP" >> $GITHUB_ENV &&
-          echo "SRS_PACKAGE_MD5=$(md5sum $SRS_PACKAGE_ZIP| awk '{print $1}')" >> $GITHUB_ENV
 
-      ################################################################
       # Tests
       - name: Build test image
         run: docker build --tag srs:test -f trunk/Dockerfile.test .
@@ -71,18 +46,22 @@ jobs:
       - name: Run SRS regression-test
         run: docker run --rm srs:test bash -c 'make && ./objs/srs -c conf/regression-test.conf && cd 3rdparty/srs-bench && make && ./objs/srs_test -test.v'
 
-      ################################################################
-      # Build
-      # Build SRS image
+      ##################################################################################################################
+      ##################################################################################################################
+      ##################################################################################################################
+      # Build SRS docker images
       - name: Build SRS docker image
         env:
           PACKAGER: ${{ secrets.SRS_PACKAGER_DOCKER }}
+          PACKAGER_DROPLET: ${{ secrets.SRS_PACKAGER_DROPLET }}
         run: |
           echo "Release ossrs/srs:$SRS_TAG"
           docker build --tag ossrs/srs:$SRS_TAG --build-arg SRS_AUTO_PACKAGER=$PACKAGER -f trunk/Dockerfile .
+          echo "Release ossrs/droplet:$SRS_TAG"
+          docker build --tag ossrs/droplet:$SRS_TAG --build-arg SRS_AUTO_PACKAGER=$PACKAGER_DROPLET -f trunk/Dockerfile .
 
-      ################################################################
-      # Docker
+      # Docker hub
+      # TODO: FIXME: If stable, please set the latest from 4.0 to 5.0
       - name: Login docker hub
         uses: docker/login-action@v1
         with:
@@ -90,12 +69,16 @@ jobs:
           password: "${{ secrets.DOCKER_PASSWORD }}"
       - name: Push to docker hub
         run: |
-          docker push ossrs/srs:$SRS_TAG
           docker tag ossrs/srs:$SRS_TAG ossrs/srs:$SRS_MAJOR
-          docker push ossrs/srs:$SRS_MAJOR
-          docker tag ossrs/srs:$SRS_TAG ossrs/srs:latest
-          docker push ossrs/srs:latest
-      # Aliyun ACR
+          #docker tag ossrs/srs:$SRS_TAG ossrs/srs:latest
+          docker push --all-tags ossrs/srs
+          #
+          docker tag ossrs/droplet:$SRS_TAG ossrs/droplet:$SRS_MAJOR
+          #docker tag ossrs/droplet:$SRS_TAG ossrs/droplet:latest
+          docker push --all-tags ossrs/droplet
+
+      # Aliyun ACR hub
+      # TODO: FIXME: If stable, please set the latest from 4.0 to 5.0
       - name: Login Aliyun docker hub
         uses: aliyun/acr-login@v1
         with:
@@ -105,32 +88,52 @@ jobs:
       - name: Push to Aliyun docker hub
         run: |
           docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_TAG
-          docker push registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_TAG
           docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_VERSION
-          docker push registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_VERSION
           docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:v$SRS_MAJOR
-          docker push registry.cn-hangzhou.aliyuncs.com/ossrs/srs:v$SRS_MAJOR
           docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_MAJOR
-          docker push registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_MAJOR
-          docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:latest
-          docker push registry.cn-hangzhou.aliyuncs.com/ossrs/srs:latest
+          #docker tag ossrs/srs:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/srs:latest
+          docker push --all-tags registry.cn-hangzhou.aliyuncs.com/ossrs/srs
+          #
+          docker tag ossrs/droplet:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/droplet:$SRS_TAG
+          docker tag ossrs/droplet:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/droplet:$SRS_VERSION
+          docker tag ossrs/droplet:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/droplet:v$SRS_MAJOR
+          docker tag ossrs/droplet:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/droplet:$SRS_MAJOR
+          #docker tag ossrs/droplet:$SRS_TAG registry.cn-hangzhou.aliyuncs.com/ossrs/droplet:latest
+          docker push --all-tags registry.cn-hangzhou.aliyuncs.com/ossrs/droplet
 
-      ################################################################
-      # K8S
-      - name: Setup KUBCONFIG for Aliyun ACK
-        run: |-
-          KUBECONFIG=$RUNNER_TEMP/kubeconfig_$(date +%s)
-          echo "${{ secrets.KUBCONFIG }}" > $KUBECONFIG
-          echo "KUBECONFIG=$KUBECONFIG" >> $GITHUB_ENV
-      # K8S for SRS 4.0
-      - name: Release SRS 4.0 to Aliyun ACK
-        if: ${{ startsWith(github.ref, 'refs/tags/v4') }}
-        run: |-
-          kubectl set image deploy/srs4-deploy srs4=registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_TAG
-          kubectl describe deploy/srs4-deploy
+      ##################################################################################################################
+      ##################################################################################################################
+      ##################################################################################################################
+      # Create source tar for release. Note that it's for OpenWRT package srs-server, so the filename MUST be
+      # srs-server-xxx.tar.gz, because the package is named srs-server.
+      # Generate variables like:
+      #   SRS_SOURCE_TAR=srs-server-5.0.145.tar.gz
+      #   SRS_SOURCE_MD5=83e38700a80a26e30b2df054e69956e5
+      - name: Create source tar.gz
+        run: |
+          DEST_DIR=srs-server-$SRS_VERSION && mkdir -p $DEST_DIR &&
+          cp README.md $DEST_DIR && cp LICENSE $DEST_DIR && cp -R trunk $DEST_DIR/trunk &&
+          (cd $DEST_DIR/trunk/3rdparty && rm -rf *.zip openssl-*.gz srs-bench) &&
+          tar zcf ${DEST_DIR}.tar.gz ${DEST_DIR} && du -sh ${DEST_DIR}* && rm -rf ${DEST_DIR} &&
+          echo "SRS_SOURCE_TAR=${DEST_DIR}.tar.gz" >> $GITHUB_ENV &&
+          echo "SRS_SOURCE_MD5=$(md5sum ${DEST_DIR}.tar.gz| awk '{print $1}')" >> $GITHUB_ENV
+      # Create package tar for release
+      # Generate variables like:
+      #   SRS_PACKAGE_ZIP=SRS-CentOS7-x86_64-5.0.145.zip
+      #   SRS_PACKAGE_MD5=3880a26e30b283edf05700a4e69956e5
+      - name: Create package zip
+        env:
+          PACKAGER: ${{ secrets.SRS_PACKAGER_BINARY }}
+        run: |
+          docker build --tag srs:pkg --build-arg version=$SRS_VERSION --build-arg SRS_AUTO_PACKAGER=$PACKAGER -f trunk/Dockerfile.pkg . &&
+          SRS_PACKAGE_ZIP=SRS-CentOS7-x86_64-$SRS_VERSION.zip &&
+          docker run --rm -v $(pwd):/output srs:pkg cp objs/$SRS_PACKAGE_ZIP /output/ &&
+          du -sh $SRS_PACKAGE_ZIP &&
+          echo "SRS_PACKAGE_ZIP=$SRS_PACKAGE_ZIP" >> $GITHUB_ENV &&
+          echo "SRS_PACKAGE_MD5=$(md5sum $SRS_PACKAGE_ZIP| awk '{print $1}')" >> $GITHUB_ENV
 
-      ################################################################
       # Create release.
+      # TODO: FIXME: Refine the release when 5.0 releoased
       - name: Create release
         id: create_release
         uses: actions/create-release@v1
@@ -145,18 +148,15 @@ jobs:
             * Source: ${{ env.SRS_SOURCE_MD5 }} [${{ env.SRS_SOURCE_TAR }}](https://github.com/ossrs/srs/releases/download/${{ env.SRS_TAG }}/${{ env.SRS_SOURCE_TAR }})
             * Binary: ${{ env.SRS_PACKAGE_MD5 }} [${{ env.SRS_PACKAGE_ZIP }}](https://github.com/ossrs/srs/releases/download/${{ env.SRS_TAG }}/${{ env.SRS_PACKAGE_ZIP }})
             ## Docker
-            * China: [docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:latest](https://github.com/ossrs/srs/wiki/v4_CN_Home#docker)
-            * China: [docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:${{ env.SRS_MAJOR }}](https://github.com/ossrs/srs/wiki/v4_CN_Home#docker)
-            * China: [docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:${{ env.SRS_TAG }}](https://github.com/ossrs/srs/wiki/v4_CN_Home#docker)
-            * Global: [docker pull ossrs/srs:latest](https://github.com/ossrs/srs/wiki/v4_EN_Home#docker)
-            * Global: [docker pull ossrs/srs:${{ env.SRS_MAJOR }}](https://github.com/ossrs/srs/wiki/v4_EN_Home#docker)
-            * Global: [docker pull ossrs/srs:${{ env.SRS_TAG }}](https://github.com/ossrs/srs/wiki/v4_EN_Home#docker)
+            * China: docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:${{ env.SRS_MAJOR }}
+            * China: docker pull registry.cn-hangzhou.aliyuncs.com/ossrs/srs:${{ env.SRS_TAG }}
+            * Global: docker pull ossrs/srs:${{ env.SRS_MAJOR }}
+            * Global: docker pull ossrs/srs:${{ env.SRS_TAG }}
             ## Doc
-            * [快速入门](https://github.com/ossrs/srs/wiki/v4_CN_Home#getting-started) or [Getting Started](https://github.com/ossrs/srs/wiki/v4_EN_Home#getting-started)
-            * [中文Wiki首页](https://github.com/ossrs/srs/wiki/v4_CN_Home) or [Wiki home](https://github.com/ossrs/srs/wiki/v4_EN_Home)
             * [FAQ](https://github.com/ossrs/srs/issues/2716), [Features](https://github.com/ossrs/srs/blob/${{ github.sha }}/trunk/doc/Features.md#features) or [ChangeLogs](https://github.com/ossrs/srs/blob/${{ github.sha }}/trunk/doc/CHANGELOG.md#changelog)
           draft: false
-          prerelease: false
+          prerelease: true
+
       # Upload release source files
       - name: Upload Release Assets Source
         id: upload-release-assets-source
@@ -166,6 +166,7 @@ jobs:
         with:
           release_id: ${{ steps.create_release.outputs.id }}
           assets_path: ${{ env.SRS_SOURCE_TAR }}
+
       # Upload release package files
       - name: Upload Release Assets Package
         id: upload-release-assets-package
@@ -176,3 +177,19 @@ jobs:
           release_id: ${{ steps.create_release.outputs.id }}
           assets_path: ${{ env.SRS_PACKAGE_ZIP }}
 
+      ##################################################################################################################
+      ##################################################################################################################
+      ##################################################################################################################
+      # K8S release to official website
+      - name: Setup KUBCONFIG for Aliyun ACK
+        run: |-
+          KUBECONFIG=$RUNNER_TEMP/kubeconfig_$(date +%s)
+          echo "${{ secrets.KUBCONFIG }}" > $KUBECONFIG
+          echo "KUBECONFIG=$KUBECONFIG" >> $GITHUB_ENV
+      # K8S for SRS 5.0
+      - name: Release SRS 5.0 to Aliyun ACK
+        if: ${{ startsWith(github.ref, 'refs/tags/v5') }}
+        run: |-
+          kubectl set image deploy/srs5-deploy srs=registry.cn-hangzhou.aliyuncs.com/ossrs/srs:$SRS_TAG
+          kubectl describe deploy/srs5-deploy
+
diff --git a/README.md b/README.md
index 804e39199..008e8682e 100755
--- a/README.md
+++ b/README.md
@@ -128,6 +128,7 @@ A big `THANK YOU` also goes to:
 
 ## Releases
 
+* 2022-01-17, Release [v4.0-b4](https://github.com/ossrs/srs/releases/tag/v4.0-b4), v4.0-b4, 4.0 beta4, v4.0.230, 144393 lines.
 * 2022-01-13, Release [v4.0-b3](https://github.com/ossrs/srs/releases/tag/v4.0-b3), v4.0-b3, 4.0 beta3, v4.0.229, 144393 lines.
 * 2022-01-03, Release [v4.0-b2](https://github.com/ossrs/srs/releases/tag/v4.0-b2), v4.0-b2, 4.0 beta2, v4.0.215, 144278 lines.
 * 2021-12-19, Release [v4.0-b1](https://github.com/ossrs/srs/releases/tag/v4.0-b1), v4.0-b1, 4.0 beta1, v4.0.206, 144126 lines.
diff --git a/trunk/conf/docker.conf b/trunk/conf/docker.conf
index 58a200442..dc7a2368b 100644
--- a/trunk/conf/docker.conf
+++ b/trunk/conf/docker.conf
@@ -31,8 +31,8 @@ vhost __defaultVhost__ {
     rtc {
         enabled     on;
         # @see https://github.com/ossrs/srs/wiki/v4_CN_WebRTC#rtmp-to-rtc
-        rtmp_to_rtc off;
+        rtmp_to_rtc on;
         # @see https://github.com/ossrs/srs/wiki/v4_CN_WebRTC#rtc-to-rtmp
-        rtc_to_rtmp off;
+        rtc_to_rtmp on;
     }
 }
diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index 38de61cc4..837d5180f 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -31,6 +31,9 @@ The changelog for SRS.
 
 ## SRS 4.0 Changelog
 
+* v4.0, 2022-01-17, Release v4.0-b4, 4.0 beta4, v4.0.230, 144393 lines.
+* v4.0, 2022-01-17, Enable rtmp2rtc and rtc2rtmp for docker.conf
+* v4.0, 2022-01-17, Support docker image for [droplet](https://hub.docker.com/r/ossrs/droplet). v4.0.230
 * v4.0, 2022-01-16, Update README for **Cloud Virtual Machine([CN](https://github.com/ossrs/srs/wiki/v4_CN_Home#cloud-virtual-machine) / [EN](https://github.com/ossrs/srs/wiki/v4_EN_Home#cloud-virtual-machine))**
 * v4.0, 2022-01-13, Merge [#2872](https://github.com/ossrs/srs/pull/2872): RTC: fix play rtc judge for config rtc2rtmp on. (#2872). v4.0.229
 * v4.0, 2022-01-13, Support configure with --config as default config file. v4.0.227
diff --git a/trunk/src/core/srs_core_version4.hpp b/trunk/src/core/srs_core_version4.hpp
index 81ee8b85c..4274d9601 100644
--- a/trunk/src/core/srs_core_version4.hpp
+++ b/trunk/src/core/srs_core_version4.hpp
@@ -9,6 +9,6 @@
 
 #define VERSION_MAJOR       4
 #define VERSION_MINOR       0
-#define VERSION_REVISION    229
+#define VERSION_REVISION    230
 
 #endif