diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
deleted file mode 100644
index 7d77234..0000000
--- a/.github/workflows/build.yml
+++ /dev/null
@@ -1,35 +0,0 @@
-name: Build Images
-
-on:
-  push:
-
-jobs:
-  docker:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Log into DockerHub
-        if: github.event_name != 'pull_request'
-        uses: docker/login-action@v3
-        with:
-          username: ${{ github.actor }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Docker meta
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ github.actor }}/ufw-docker-agent
-
-      - name: Build and push
-        uses: docker/build-push-action@v6
-        with:
-          push: ${{ github.event_name != 'pull_request' }}
-          platforms: linux/amd64,linux/arm64/v8
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
diff --git a/Dockerfile b/Dockerfile
index f8e5fd9..eee76c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
-FROM ubuntu:24.04
+FROM ubuntu:22.04
 
-ARG docker_version="27.3.1"
+ARG docker_version="20.10.17"
 
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
@@ -12,7 +12,8 @@ RUN apt-get update \
             | tee /etc/apt/sources.list.d/docker.list > /dev/null \
     && apt-get update \
     && apt-get install -y --no-install-recommends locales ufw \
-    && apt-get install -y --no-install-recommends "docker-ce=$(apt-cache madison docker-ce | grep -m1 -F "${docker_version}" | cut -d'|' -f2 | tr -d '[[:blank:]]')" \
+    && ( apt-get install -y --no-install-recommends "docker-ce=5:${docker_version}~*" || \
+         apt-get install -y --no-install-recommends "docker-ce=${docker_version}~*" ) \
     && locale-gen en_US.UTF-8 \
     && apt-get clean autoclean \
     && apt-get autoremove --yes \
diff --git a/Vagrantfile b/Vagrantfile
index ee11fa8..ced906d 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -6,15 +6,16 @@
 ENV['VAGRANT_NO_PARALLEL']="true"
 
 Vagrant.configure('2') do |config|
+
+  docker_version = "20.10.17"
+
   ubuntu_version = File.readlines("Dockerfile").filter { |line|
     line.start_with?("FROM ")
   }.first.match(/\d\d\.\d\d/)[0]
 
-  docker_version = File.readlines("Dockerfile").filter { |line|
-    line.start_with?("ARG docker_version=")
-  }.first.match(/"([\d\.]+)"/)[1]
+  config.vm.box = "chaifeng/ubuntu-#{ubuntu_version}-docker-#{docker_version}#{(`uname -m`.strip == "arm64")?"-arm64":""}"
 
-  config.vm.box = "chaifeng/ubuntu-#{ubuntu_version}-docker-#{docker_version}"
+  #config.vm.box = "chaifeng/ubuntu-20.04-docker-20.10.17#{(`uname -m`.strip == "arm64")?"-arm64":""}"
 
   config.vm.provider 'virtualbox' do |vb|
     vb.memory = '1024'
@@ -177,10 +178,9 @@ DOCKERFILE
 
         ufw-docker service allow public_service 80/tcp
 
-        docker service inspect "public_multiport" ||
-            docker service create --name "public_multiport" \
-                --publish "40080:80" --publish "47000:7000" --publish "48080:8080" \
-                --env name="public_multiport" --replicas 3 #{private_registry}/chaifeng/hostname-webapp
+        docker service create --name "public_multiport" \
+            --publish "40080:80" --publish "47000:7000" --publish "48080:8080" \
+            --env name="public_multiport" --replicas 3 #{private_registry}/chaifeng/hostname-webapp
 
         ufw-docker service allow public_multiport 80/tcp
         ufw-docker service allow public_multiport 8080/tcp
@@ -202,11 +202,6 @@ DOCKERFILE
     end
   end
 
-  config.vm.define "node-internal" do |node|
-    node.vm.hostname = "node-internal"
-    node.vm.network "private_network", ip: "#{ip_prefix}.142"
-  end
-
   config.vm.define "external" do |external|
     external.vm.hostname = "external"
     external.vm.network "private_network", ip: "#{ip_prefix}.127"
diff --git a/test/bach b/test/bach
index 27885eb..447edb6 160000
--- a/test/bach
+++ b/test/bach
@@ -1 +1 @@
-Subproject commit 27885eb79c11e4652dede994c886ae5f9e30994f
+Subproject commit 447edb60db232d3dbc2267f37c49bd7a070cc83d
diff --git a/test/ufw-docker.test.sh b/test/ufw-docker.test.sh
index 73ca3f7..9d5daa7 100755
--- a/test/ufw-docker.test.sh
+++ b/test/ufw-docker.test.sh
@@ -15,10 +15,7 @@ source "$working_dir"/bach/bach.sh
     @mock iptables --version
     @mocktrue grep -F '(legacy)'
 
-    @mocktrue docker -v
-    @mock docker -v === @stdout Docker version 0.0.0, build dummy
-
-    @mockpipe remove_blank_lines
+    @ignore remove_blank_lines
     @ignore echo
     @ignore err
 
@@ -101,17 +98,6 @@ test-ufw-is-disabled-assert() {
 }
 
 
-test-docker-is-installed() {
-    @mockfalse docker -v
-
-    ufw-docker
-}
-test-docker-is-installed-assert() {
-    die "Docker executable not found."
-    ufw-docker--help
-}
-
-
 test-ufw-docker-status() {
     ufw-docker status
 }
@@ -465,7 +451,7 @@ test-ufw-docker--instance-name-found-a-name() {
 }
 test-ufw-docker--instance-name-found-a-name-assert() {
     docker inspect --format="{{.Name}}" foo
-    @dryrun echo -n foo
+    echo -n foo
 }
 
 
@@ -557,7 +543,7 @@ test-ufw-docker--list-number-assert() {
 
 test-ufw-docker--delete-empty-result() {
     @mock ufw-docker--list-number webapp 80 tcp === @stdout ""
-    @mockpipe sort -rn
+    @mock sort -rn
 
     load-ufw-docker-function ufw-docker--delete
     ufw-docker--delete webapp 80 tcp
@@ -569,7 +555,7 @@ test-ufw-docker--delete-empty-result-assert() {
 
 test-ufw-docker--delete-all() {
     @mock ufw-docker--list-number webapp 80 tcp === @stdout 5 8 9
-    @mockpipe sort -rn
+    @mock sort -rn
 
     load-ufw-docker-function ufw-docker--delete
     ufw-docker--delete webapp 80 tcp
diff --git a/ufw-docker b/ufw-docker
index cc5a187..6ea6b7c 100755
--- a/ufw-docker
+++ b/ufw-docker
@@ -5,7 +5,7 @@ set -euo pipefail
 LANG=en_US.UTF-8
 LANGUAGE=en_US:
 LC_ALL=en_US.UTF-8
-PATH="/bin:/usr/bin:/sbin:/usr/sbin:/snap/bin/"
+PATH="/bin:/usr/bin:/sbin:/usr/sbin"
 
 GREP_REGEXP_INSTANCE_NAME="[-_.[:alnum:]]\\+"
 DEFAULT_PROTO=tcp
@@ -424,10 +424,6 @@ if ! ufw status 2>/dev/null | grep -Fq "Status: active" ; then
     die "UFW is disabled or you are not root user, or mismatched iptables legacy/nf_tables, current $(iptables --version)"
 fi
 
-if ! docker -v &> /dev/null; then
-  die "Docker executable not found."
-fi
-
 ufw_action="${1:-help}"
 
 case "$ufw_action" in