diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 12342f9..e549596 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -13,3 +13,7 @@ updates:
     directory: "/auto-pipeline-examples"
     schedule:
       interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ecb16d9..0f3ce27 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,14 +18,14 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-20.04, windows-2022 ]
-        java: [ 8, 20 ]
+        java: [ 8, 21 ]
       fail-fast: false
       max-parallel: 32
-    name: Test JDK ${{ matrix.java }}, ${{ matrix.os }}
+    name: CI on JDK ${{ matrix.java }} OS ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-java@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
         with:
           distribution: zulu
           java-version: ${{ matrix.java }}
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index d2deb6d..708cf9e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -10,7 +10,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Install mdbook
diff --git a/.github/workflows/strong-ci.yml b/.github/workflows/strong-ci.yml
index 21cca0d..3ea3d44 100644
--- a/.github/workflows/strong-ci.yml
+++ b/.github/workflows/strong-ci.yml
@@ -19,39 +19,34 @@ jobs:
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#choosing-github-hosted-runners
     runs-on: ubuntu-latest
     timeout-minutes: 15
-    name: test by multiply java versions
+    name: CI by multiply java versions
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
 
       - name: setup Java 8
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 8
           distribution: zulu
           # only first java setup need enable cache
           cache: maven
       - name: setup Java 11
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 11
           distribution: microsoft
       - name: setup Java 17
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           java-version: 17
           distribution: microsoft
-      - name: setup Java 20
-        uses: actions/setup-java@v3
-        with:
-          java-version: 20
-          distribution: zulu
       - name: setup Java 21
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
-          java-version: 21-ea
+          java-version: 21
           distribution: zulu
 
       - run: scripts/integration_test
@@ -59,7 +54,6 @@ jobs:
           JAVA8_HOME: ${{ env.JAVA_HOME_8_X64 }}
           JAVA11_HOME: ${{ env.JAVA_HOME_11_X64 }}
           JAVA17_HOME: ${{ env.JAVA_HOME_17_X64 }}
-          JAVA20_HOME: ${{ env.JAVA_HOME_20_X64 }}
           JAVA21_HOME: ${{ env.JAVA_HOME_21_X64 }}
 
       - name: remove self maven install files
diff --git a/scripts/bash-buddy b/scripts/bash-buddy
index eb0cb6f..e3b1586 160000
--- a/scripts/bash-buddy
+++ b/scripts/bash-buddy
@@ -1 +1 @@
-Subproject commit eb0cb6fc995ec14ba20b9fca5a7779937212c31f
+Subproject commit e3b1586dc53f15b9b8a8ff74c2d0b3108872a61b
diff --git a/scripts/clear_appveyor_cache b/scripts/clear_appveyor_cache
deleted file mode 100755
index 266d4c5..0000000
--- a/scripts/clear_appveyor_cache
+++ /dev/null
@@ -1,36 +0,0 @@
-#!/usr/bin/env pwsh
-
-$appveyor_project = "oldratlee/auto-pipeline"
-
-# https://stackoverflow.com/questions/24649019/how-to-use-confirm-in-powershell
-$confirmation = Read-Host "Are you Sure You Want To Clear cache of appveyor project $appveyor_project [y/N]"
-if ($confirmation -ne 'y')
-{
-    Write-Output "do nothing and exit"
-    exit
-}
-
-# PowerShell: Run command from script's directory - Stack Overflow
-# https://stackoverflow.com/questions/4724290
-# $script_path = $MyInvocation.MyCommand.Path
-# $script_dir = Split-Path $script_path
-
-# Equivalent of bash's `source` command in Powershell? - Super User
-#   https://superuser.com/questions/71446
-# Script scope and dot sourcing - PowerShell | Microsoft Docs
-#   https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_scripts#script-scope-and-dot-sourcing
-# PowerShell: How to quickly switch to your home directory
-#   https://sid-500.com/2017/08/03/powershell-how-to-quickly-switch-to-your-home-directory/
-. "$home\.appveyor_token.ps1"
-# file appveyor_token.ps1 provide appveyor token. content sample:
-#   $appveyor_token = xxx
-
-# https://www.appveyor.com/docs/build-cache/#remove-cache-entry-from-build-config
-# https://www.appveyor.com/docs/api/#authentication
-
-$headers = @{ }
-$headers['Authorization'] = "Bearer $appveyor_token"
-$headers["Content-type"] = "application/json"
-$uri = "https://ci.appveyor.com/api/projects/$appveyor_project/buildcache"
-
-Invoke-RestMethod -Uri $uri -Headers $headers -Method Delete
diff --git a/scripts/integration_test b/scripts/integration_test
index 98b88ab..a33fb36 100755
--- a/scripts/integration_test
+++ b/scripts/integration_test
@@ -6,7 +6,8 @@ BASH_BUDDY_ROOT="$(readlink -f bash-buddy)"
 readonly BASH_BUDDY_ROOT
 source "$BASH_BUDDY_ROOT/lib/trap_error_info.sh"
 source "$BASH_BUDDY_ROOT/lib/common_utils.sh"
-source "$BASH_BUDDY_ROOT/lib/java_build_utils.sh"
+source "$BASH_BUDDY_ROOT/lib/java_utils.sh"
+source "$BASH_BUDDY_ROOT/lib/maven_utils.sh"
 
 ################################################################################
 # ci build logic
@@ -18,10 +19,8 @@ readonly JDK_VERSIONS=(
   8
   $default_build_jdk_version
   17
-  20
   21
 )
-readonly default_jh_var_name="JAVA${default_build_jdk_version}_HOME"
 
 # here use `install` and `-D performRelease` intended
 #   to check release operations.
@@ -30,8 +29,8 @@ readonly default_jh_var_name="JAVA${default_build_jdk_version}_HOME"
 #   https://stackoverflow.com/questions/25201430
 #
 # shellcheck disable=SC2034
-readonly JVB_MVN_OPTS=(
-  "${JVB_DEFAULT_MVN_OPTS[@]}"
+readonly MVU_MVN_OPTS=(
+  "${MVU_DEFAULT_MVN_OPTS[@]}"
   -DperformRelease -P'!gen-sign'
   ${CI_MORE_MVN_OPTS:+${CI_MORE_MVN_OPTS}}
 )
@@ -42,42 +41,35 @@ cd ..
 # build and test by default version jdk
 ########################################
 
-[ -d "${!default_jh_var_name:-}" ] || cu::die "\$${default_jh_var_name}(${!default_jh_var_name:-}) dir is not existed!"
-export JAVA_HOME="${!default_jh_var_name}"
+jvu::switch_to_jdk "$default_build_jdk_version"
 
 cu::head_line_echo "build and test with Java $default_build_jdk_version: $JAVA_HOME"
-jvb::mvn_cmd clean install
+mvu::mvn_cmd clean install
 
 ########################################
 # test by multiply version jdks
 ########################################
 
+# about CI env var
+#   https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
+if [ "${CI:-}" = true ]; then
+  readonly CI_MORE_BEGIN_OPTS=jacoco:prepare-agent CI_MORE_END_OPTS=jacoco:report
+fi
+
 for jdk_version in "${JDK_VERSIONS[@]}"; do
-  jh_var_name="JAVA${jdk_version}_HOME"
-  [ -d "${!jh_var_name:-}" ] || cu::die "\$${jh_var_name}(${!jh_var_name:-}) dir is not existed!"
-  export JAVA_HOME="${!jh_var_name}"
+  jvu::switch_to_jdk "$jdk_version"
 
   # just test without build
   cu::head_line_echo "test with Java $jdk_version: $JAVA_HOME"
 
-  # about CI env var
-  #   https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
-  if [ "${CI:-}" = true ]; then
-    # skip default jdk, already tested above
-    [ "$jdk_version" = "$default_build_jdk_version" ] &&
-      jvb::mvn_cmd jacoco:prepare-agent surefire:test jacoco:report
-
-    # Test for slf4j v1
-    jvb::mvn_cmd jacoco:prepare-agent -P enable-slf4j-v1 dependency:tree surefire:test jacoco:report
-  else
-    # skip default jdk, already tested above
-    [ "$jdk_version" = "$default_build_jdk_version" ] &&
-      jvb::mvn_cmd surefire:test
-
-    # Test for slf4j v1
-    jvb::mvn_cmd -P enable-slf4j-v1 dependency:tree surefire:test
+  # skip default jdk, already tested above
+  if [ "$jdk_version" != "$default_build_jdk_version" ]; then
+    mvu::mvn_cmd ${CI_MORE_BEGIN_OPTS:-} surefire:test ${CI_MORE_END_OPTS:-}
   fi
 
+  # Test for slf4j v1
+  mvu::mvn_cmd ${CI_MORE_BEGIN_OPTS:-} -P enable-slf4j-v1 dependency:tree surefire:test ${CI_MORE_END_OPTS:-}
+
   (
     cd auto-pipeline-examples
     cu::log_then_run ./gradlew clean test