diff --git a/.github/workflows/build_main.yml b/.github/workflows/build_main.yml
index 42d2277..26d8a98 100644
--- a/.github/workflows/build_main.yml
+++ b/.github/workflows/build_main.yml
@@ -10,71 +10,6 @@ on:
     tags:
       - "[2-9][0-9][0-9][0-9].[0-9]+-rev[0-9]+"
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-    - name: Checkout Source
-      uses: actions/checkout@v3
-      with:
-        submodules: recursive
-    - name: Verify Gradle Wrapper
-      uses: gradle/wrapper-validation-action@v1
-    - name: Set up JDK 17
-      uses: actions/setup-java@v3
-      with:
-        distribution: 'temurin'
-        java-version: 17
-
-    # If we're building a release, we need to set the variable RELEASE_VERSION
-    - name: Set Environment Variables for Release Version
-      if: startsWith(github.ref, 'refs/tags/')
-      run: echo "RELEASE_VERSION=${GITHUB_REF:10}" >> $GITHUB_ENV
-
-    - name: Execute Gradle Build
-      uses: gradle/gradle-build-action@v2
-      env:
-        CI: true
-      with:
-        gradle-version: wrapper
-        arguments: buildDocs
-
-    # release and deploy only if we're building a release
-    - name: Prepare Deployment
-      if: startsWith(github.ref, 'refs/tags/')
-      run: |
-        rm -rf ./build/tmp
-        cp ./docs-ext/curriculum-*.pdf ./build 2>/dev/null || :
-        zip -r release.zip ./build
-        mkdir release_dir
-        cp ./build/curriculum-*.pdf ./release_dir 2>/dev/null || :
-        mv release.zip ./release_dir/release-${{ env.RELEASE_VERSION }}.zip
-    - name: Create New Release
-      if: startsWith(github.ref, 'refs/tags/')
-      id: create-release
-      uses: ncipollo/release-action@v1
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
-      with:
-        tag: ${{ env.RELEASE_VERSION }}
-        name: Release ${{ env.RELEASE_VERSION }}
-        draft: false
-        prerelease: false
-        bodyFile: "CHANGELOG.md"
-        artifacts: "license-copyright/LICENSE.adoc,release_dir/*.pdf,release_dir/*.zip"
-        token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Deploy
-      if: startsWith(github.ref, 'refs/tags/')
-      uses: peaceiris/actions-gh-pages@v3
-      with:
-        github_token: ${{ secrets.GITHUB_TOKEN }}
-        publish_dir: ./build
-        user_name: 'github-actions[bot]'
-        user_email: 'github-actions[bot]@users.noreply.github.com'
-        commit_message: Publish Release ${{ env.RELEASE_VERSION }}
+  call_workflow_build:
+    uses: isaqb-org/github-workflows/.github/workflows/build_main.yml@main
diff --git a/.github/workflows/build_pr.yml b/.github/workflows/build_pr.yml
index a1d0aa0..df494bc 100644
--- a/.github/workflows/build_pr.yml
+++ b/.github/workflows/build_pr.yml
@@ -7,37 +7,7 @@ name: CI – Pull Requests
 on:
   pull_request:
     branches: [ main ]
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
-jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
 
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: checkout source
-        uses: actions/checkout@v3
-        with:
-          submodules: recursive
-      - name: Verify Gradle Wrapper
-        uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
-        with:
-          distribution: 'temurin'
-          java-version: 17
-      - name: Execute Gradle Build
-        uses: gradle/gradle-build-action@v2
-        with:
-          gradle-version: wrapper
-          arguments: buildDocs
-      - name: Upload Build Artifacts
-        uses: actions/upload-artifact@v3
-        with:
-          name: curriculum files (PDF and HTML)
-          path: |
-            build/*.pdf
-            build/*.html
-          retention-days: 10
+jobs:
+  call_workflow_build_pr:
+    uses: isaqb-org/github-workflows/.github/workflows/build_pr.yml@main
diff --git a/.github/workflows/build_releasecandidate.yml b/.github/workflows/build_releasecandidate.yml
index 005b42d..e6d6511 100644
--- a/.github/workflows/build_releasecandidate.yml
+++ b/.github/workflows/build_releasecandidate.yml
@@ -9,77 +9,6 @@ on:
     tags:
       - "[2-9][0-9][0-9][0-9].[0-9]+-RC[0-9]+"
 
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout Source
-        uses: actions/checkout@v3
-        with:
-          submodules: recursive
-      - name: Update index.adoc
-        run: |
-          rm docs/index.adoc
-          mv docs/index_rc.adoc docs/index.adoc
-      - name: Verify Gradle Wrapper
-        uses: gradle/wrapper-validation-action@v1
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
-        with:
-          distribution: 'temurin'
-          java-version: 17
-
-      # If we're building a release, we need to set the variable RELEASE_VERSION
-      - name: Set Environment Variables for Release Version
-        if: startsWith(github.ref, 'refs/tags/')
-        run: echo "RELEASE_VERSION=${GITHUB_REF:10}" >> $GITHUB_ENV
-
-      - name: Execute Gradle Build
-        uses: gradle/gradle-build-action@v2
-        env:
-          CI: true
-        with:
-          gradle-version: wrapper
-          arguments: buildDocs
-
-      # do the following two things only for a release!
-      - name: Prepare Deployment
-        if: startsWith(github.ref, 'refs/tags/')
-        run: |
-          rm -rf ./build/tmp
-          cp ./docs-ext/curriculum-*.pdf ./build 2>/dev/null || :
-          zip -r release.zip ./build
-          mkdir release_dir
-          cp ./build/curriculum-*.pdf ./release_dir 2>/dev/null || :
-          mv release.zip ./release_dir/release-${{ env.RELEASE_VERSION }}.zip
-      - name: Create New Release Candidate
-        if: startsWith(github.ref, 'refs/tags/')
-        id: create-release-candidate
-        uses: ncipollo/release-action@v1
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by Actions, you do not need to create your own token
-        with:
-          tag: ${{ env.RELEASE_VERSION }}
-          name: Release Candidate ${{ env.RELEASE_VERSION }}
-          draft: false
-          prerelease: true
-          bodyFile: "CHANGELOG.md"
-          artifacts: "license-copyright/LICENSE.adoc,release_dir/*.pdf,release_dir/*.zip"
-          token: ${{ secrets.GITHUB_TOKEN }}
-      - name: Deploy Release Candidate to GitHub Pages
-        if: startsWith(github.ref, 'refs/tags/')
-        uses: peaceiris/actions-gh-pages@v3
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./build
-          destination_dir: release-candidate
-          keep_files: true
-          user_name: 'github-actions[bot]'
-          user_email: 'github-actions[bot]@users.noreply.github.com'
-          commit_message: Publish Release Candidate ${{ env.RELEASE_VERSION }}
+  call_workflow_build_pr:
+    uses: isaqb-org/github-workflows/.github/workflows/build_releasecandidate.yml@main
diff --git a/.github/workflows/update_pr_with_comment.yml b/.github/workflows/update_pr_with_comment.yml
index 172c879..539e577 100644
--- a/.github/workflows/update_pr_with_comment.yml
+++ b/.github/workflows/update_pr_with_comment.yml
@@ -6,66 +6,5 @@ on:
     workflows: [CI – Pull Requests]
 
 jobs:
-  comment:
-    if: ${{ github.event.workflow_run.conclusion == 'success' }} && ${{github.event_name == 'pull_request' }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Get Artifact and Pull request info
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-          WORKFLOW_RUN_EVENT_OBJ: ${{ toJSON(github.event.workflow_run) }}
-          OWNER: ${{ github.repository_owner }}
-          REPO: ${{ github.event.repository.name }}
-        run: |
-          PREVIOUS_JOB_ID=$(jq -r '.id' <<< "$WORKFLOW_RUN_EVENT_OBJ")
-          echo "Previous Job ID: $PREVIOUS_JOB_ID"
-          echo "PREVIOUS_JOB_ID=$PREVIOUS_JOB_ID" >> "$GITHUB_ENV"
-          
-          SUITE_ID=$(jq -r '.check_suite_id' <<< "$WORKFLOW_RUN_EVENT_OBJ")
-          echo "Previous Suite ID: $SUITE_ID"
-          echo "SUITE_ID=$SUITE_ID" >> "$GITHUB_ENV"
-          
-          ARTIFACT_ID=$(gh api "/repos/$OWNER/$REPO/actions/artifacts" \
-            --jq ".artifacts.[] |
-            select(.workflow_run.id==${PREVIOUS_JOB_ID}) |
-            select(.expired==false) |
-            .id")
-          
-          echo "Artifact ID: $ARTIFACT_ID"
-          echo "ARTIFACT_ID=$ARTIFACT_ID" >> "$GITHUB_ENV"
-          
-          PR_NUMBER=$(jq -r '.pull_requests[0].number' \
-            <<< "$WORKFLOW_RUN_EVENT_OBJ")
-          
-          echo "Pull request Number: $PR_NUMBER"
-          echo "PR_NUMBER=$PR_NUMBER" >> "$GITHUB_ENV"
-          
-          HEAD_SHA=$(jq -r '.pull_requests[0].head.sha' \
-            <<< "$WORKFLOW_RUN_EVENT_OBJ")
-          
-          echo "Head SHA: $HEAD_SHA"
-          echo "HEAD_SHA=$HEAD_SHA" >> "$GITHUB_ENV"
-      - name: Find Comment
-        uses: peter-evans/find-comment@v2
-        id: find-comment
-        with:
-          issue-number: ${{ env.PR_NUMBER }}
-          comment-author: 'github-actions[bot]'
-      - name: Update Comment
-        env:
-          JOB_PATH: "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ env.PREVIOUS_JOB_ID }}"
-          ARTIFACT_URL: "${{ github.server_url }}/${{ github.repository }}/suites/${{ env.SUITE_ID }}/artifacts/${{ env.ARTIFACT_ID }}"
-          HEAD_SHA: "${{ env.HEAD_SHA }}"
-        uses: peter-evans/create-or-update-comment@v3
-        with:
-          issue-number: ${{ env.PR_NUMBER }}
-          comment-id: ${{ steps.find-comment.outputs.comment-id }}
-          edit-mode: replace
-          body: |-            
-            Build Successful! You can find a link to the downloadable artifacts below.
-            
-            | Name     | Link                    |
-            | -------- | ----------------------- |
-            | Commit   | ${{ env.HEAD_SHA }}     |
-            | Logs     | ${{ env.JOB_PATH }}     |
-            | Download | ${{ env.ARTIFACT_URL }} |
+  call_workflow_build:
+    uses: isaqb-org/github-workflows/.github/workflows/update_pr_with_comment.yml@main
diff --git a/.gitignore b/.gitignore
index 68e8a0f..d39da11 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,9 @@
 .DS_Store
 
 .gradle
+gradlew
+gradlew.bat
+gradle/
 build
 .idea
 topic-backlog-expert-level.iml
diff --git a/.gitmodules b/.gitmodules
index f80c461..15a8ee2 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "license-copyright"]
 	path = license-copyright
 	url = https://github.com/isaqb-org/license-copyright
+[submodule "gradle-tools"]
+	path = gradle-tools
+	url = https://github.com/isaqb-org/gradle-tools
diff --git a/README.adoc b/README.adoc
index aa652e5..51e1122 100644
--- a/README.adoc
+++ b/README.adoc
@@ -33,10 +33,7 @@ Create an issue, a merge- or pull-request
 == How to build the documents
 Prerequisite: You need a Java Runtime(tm) installed.
 
-You build the output documents with gradle:
-[source,console]
-$ ./gradlew buildDocs
-
+You build the output documents with gradle: `./gradle-tools/gradlew buildDocs`
 That will produce both pdf and html output in German (DE) _and_ English (EN), unless you modify the configuration.
 
 In case you want to change that, adjust the following part of `build.gradle`:
diff --git a/build.gradle b/build.gradle
index 8fdbc7b..a5e9648 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,42 +1,6 @@
-import java.text.SimpleDateFormat
-
-plugins {
-    id "java"
-    id "application"
-}
-
-def group = "org.isaqb"
-def releaseVersion = System.getenv("RELEASE_VERSION")
-def localVersion = "LocalBuild"
-project.version = releaseVersion == null ? localVersion : releaseVersion
-def curriculumFileName = "topic-backlog-expert-level"
-def versionDate = new SimpleDateFormat("yyyyMMdd").format(new Date())
-def languages = ["DE", "EN"]
-
-repositories {
-    mavenCentral()
-}
-
-dependencies {
-    implementation("org.asciidoctor:asciidoctorj:2.5.10")
-    implementation("org.asciidoctor:asciidoctorj-pdf:2.3.9")
-}
-
-application {
-    mainClass.set("org.isaqb.asciidoc.Main")
-    applicationDefaultJvmArgs = [
-        """-DprojectVersion=${project.version}""",
-        """-DcurriculumFileName=${curriculumFileName}""",
-        """-DversionDate=${versionDate}""",
-        """-Dlanguages=${languages.join(',')}""",
-        """--add-opens""", """java.base/sun.nio.ch=ALL-UNNAMED""",
-        """--add-opens""", """java.base/java.io=ALL-UNNAMED"""]
-}
-
-tasks.register('buildDocs') {
-    description = 'Grouping task for generating all languages in several formats'
-    group = 'documentation'
-    dependsOn "run"
+ext {
+    curriculumFileName = "topic-backlog-expert-level"
+    languages = ["DE", "EN"]
 }
 
-defaultTasks "buildDocs"
+defaultTasks 'buildDocs'
diff --git a/gradle-tools b/gradle-tools
new file mode 160000
index 0000000..96b90ba
--- /dev/null
+++ b/gradle-tools
@@ -0,0 +1 @@
+Subproject commit 96b90ba98b8d5eb3d709163305b479d15d146b38
diff --git a/gradle.properties b/gradle.properties
deleted file mode 100644
index b8c8a87..0000000
--- a/gradle.properties
+++ /dev/null
@@ -1 +0,0 @@
-org.gradle.jvmargs=-Xmx1024m --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
deleted file mode 100644
index d64cd49..0000000
Binary files a/gradle/wrapper/gradle-wrapper.jar and /dev/null differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
deleted file mode 100644
index 1af9e09..0000000
--- a/gradle/wrapper/gradle-wrapper.properties
+++ /dev/null
@@ -1,7 +0,0 @@
-distributionBase=GRADLE_USER_HOME
-distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
-networkTimeout=10000
-validateDistributionUrl=true
-zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
deleted file mode 100755
index 1aa94a4..0000000
--- a/gradlew
+++ /dev/null
@@ -1,249 +0,0 @@
-#!/bin/sh
-
-#
-# Copyright © 2015-2021 the original authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      https://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-##############################################################################
-#
-#   Gradle start up script for POSIX generated by Gradle.
-#
-#   Important for running:
-#
-#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
-#       noncompliant, but you have some other compliant shell such as ksh or
-#       bash, then to run this script, type that shell name before the whole
-#       command line, like:
-#
-#           ksh Gradle
-#
-#       Busybox and similar reduced shells will NOT work, because this script
-#       requires all of these POSIX shell features:
-#         * functions;
-#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
-#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
-#         * compound commands having a testable exit status, especially «case»;
-#         * various built-in commands including «command», «set», and «ulimit».
-#
-#   Important for patching:
-#
-#   (2) This script targets any POSIX shell, so it avoids extensions provided
-#       by Bash, Ksh, etc; in particular arrays are avoided.
-#
-#       The "traditional" practice of packing multiple parameters into a
-#       space-separated string is a well documented source of bugs and security
-#       problems, so this is (mostly) avoided, by progressively accumulating
-#       options in "$@", and eventually passing that to Java.
-#
-#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
-#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
-#       see the in-line comments for details.
-#
-#       There are tweaks for specific operating systems such as AIX, CygWin,
-#       Darwin, MinGW, and NonStop.
-#
-#   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
-#       within the Gradle project.
-#
-#       You can find Gradle at https://github.com/gradle/gradle/.
-#
-##############################################################################
-
-# Attempt to set APP_HOME
-
-# Resolve links: $0 may be a link
-app_path=$0
-
-# Need this for daisy-chained symlinks.
-while
-    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
-    [ -h "$app_path" ]
-do
-    ls=$( ls -ld "$app_path" )
-    link=${ls#*' -> '}
-    case $link in             #(
-      /*)   app_path=$link ;; #(
-      *)    app_path=$APP_HOME$link ;;
-    esac
-done
-
-# This is normally unused
-# shellcheck disable=SC2034
-APP_BASE_NAME=${0##*/}
-# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
-
-# Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD=maximum
-
-warn () {
-    echo "$*"
-} >&2
-
-die () {
-    echo
-    echo "$*"
-    echo
-    exit 1
-} >&2
-
-# OS specific support (must be 'true' or 'false').
-cygwin=false
-msys=false
-darwin=false
-nonstop=false
-case "$( uname )" in                #(
-  CYGWIN* )         cygwin=true  ;; #(
-  Darwin* )         darwin=true  ;; #(
-  MSYS* | MINGW* )  msys=true    ;; #(
-  NONSTOP* )        nonstop=true ;;
-esac
-
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
-
-
-# Determine the Java command to use to start the JVM.
-if [ -n "$JAVA_HOME" ] ; then
-    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
-        # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD=$JAVA_HOME/jre/sh/java
-    else
-        JAVACMD=$JAVA_HOME/bin/java
-    fi
-    if [ ! -x "$JAVACMD" ] ; then
-        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-    fi
-else
-    JAVACMD=java
-    if ! command -v java >/dev/null 2>&1
-    then
-        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-
-Please set the JAVA_HOME variable in your environment to match the
-location of your Java installation."
-    fi
-fi
-
-# Increase the maximum file descriptors if we can.
-if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
-    case $MAX_FD in #(
-      max*)
-        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC2039,SC3045
-        MAX_FD=$( ulimit -H -n ) ||
-            warn "Could not query maximum file descriptor limit"
-    esac
-    case $MAX_FD in  #(
-      '' | soft) :;; #(
-      *)
-        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC2039,SC3045
-        ulimit -n "$MAX_FD" ||
-            warn "Could not set maximum file descriptor limit to $MAX_FD"
-    esac
-fi
-
-# Collect all arguments for the java command, stacking in reverse order:
-#   * args from the command line
-#   * the main class name
-#   * -classpath
-#   * -D...appname settings
-#   * --module-path (only if needed)
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if "$cygwin" || "$msys" ; then
-    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
-
-    JAVACMD=$( cygpath --unix "$JAVACMD" )
-
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    for arg do
-        if
-            case $arg in                                #(
-              -*)   false ;;                            # don't mess with options #(
-              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
-                    [ -e "$t" ] ;;                      #(
-              *)    false ;;
-            esac
-        then
-            arg=$( cygpath --path --ignore --mixed "$arg" )
-        fi
-        # Roll the args list around exactly as many times as the number of
-        # args, so each arg winds up back in the position where it started, but
-        # possibly modified.
-        #
-        # NB: a `for` loop captures its iteration list before it begins, so
-        # changing the positional parameters here affects neither the number of
-        # iterations, nor the values presented in `arg`.
-        shift                   # remove old arg
-        set -- "$@" "$arg"      # push replacement arg
-    done
-fi
-
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
-# Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
-#     and any embedded shellness will be escaped.
-#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
-#     treated as '${Hostname}' itself on the command line.
-
-set -- \
-        "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
-        "$@"
-
-# Stop when "xargs" is not available.
-if ! command -v xargs >/dev/null 2>&1
-then
-    die "xargs is not available"
-fi
-
-# Use "xargs" to parse quoted args.
-#
-# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
-#
-# In Bash we could simply go:
-#
-#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
-#   set -- "${ARGS[@]}" "$@"
-#
-# but POSIX shell has neither arrays nor command substitution, so instead we
-# post-process each arg (as a line of input to sed) to backslash-escape any
-# character that might be a shell metacharacter, then use eval to reverse
-# that process (while maintaining the separation between arguments), and wrap
-# the whole thing up as a single "set" statement.
-#
-# This will of course break if any of these variables contains a newline or
-# an unmatched quote.
-#
-
-eval "set -- $(
-        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
-        xargs -n1 |
-        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
-        tr '\n' ' '
-    )" '"$@"'
-
-exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
deleted file mode 100644
index 6689b85..0000000
--- a/gradlew.bat
+++ /dev/null
@@ -1,92 +0,0 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%"=="" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%"=="" set DIRNAME=.
-@rem This is normally unused
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if %ERRORLEVEL% equ 0 goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if %ERRORLEVEL% equ 0 goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-set EXIT_CODE=%ERRORLEVEL%
-if %EXIT_CODE% equ 0 set EXIT_CODE=1
-if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
-exit /b %EXIT_CODE%
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..c6c4e15
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+include('gradle-tools')
\ No newline at end of file
diff --git a/src/main/java/org/isaqb/asciidoc/Main.java b/src/main/java/org/isaqb/asciidoc/Main.java
deleted file mode 100644
index 456e4db..0000000
--- a/src/main/java/org/isaqb/asciidoc/Main.java
+++ /dev/null
@@ -1,165 +0,0 @@
-package org.isaqb.asciidoc;
-
-import org.asciidoctor.Asciidoctor;
-import org.asciidoctor.Attributes;
-import org.asciidoctor.Options;
-import org.asciidoctor.SafeMode;
-
-import java.io.File;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.stream.Stream;
-
-import static org.asciidoctor.Asciidoctor.Factory.create;
-
-public class Main {
-
-  private static final String PROJECT_VERSION = "projectVersion";
-  private static final String CURRICULUM_FILE_NAME = "curriculumFileName";
-  private static final String INDEX_FILE_NAME = "index";
-  private static final String VERSION_DATE = "versionDate";
-  private static final String LANGUAGES = "languages";
-  private static final String[] FORMATS = {"html", "pdf"};
-
-  private static final String LANGUAGE_SEPERATOR = ",";
-
-  private static final String SOURCE_DIR = "./docs/";
-  private static final String BASE_DIR = SOURCE_DIR;
-  private static final String OUTPUT_DIR = "./build/";
-
-  private static final String ADOC = "adoc";
-  private static final String HTML = "html";
-  private static final String HTML5 = "html5";
-  private static final String PDF = "pdf";
-  private static final String ENGLISH = "EN";
-
-  public static void main(final String[] args) {
-    Objects.requireNonNull(System.getProperty(PROJECT_VERSION));
-    Objects.requireNonNull(System.getProperty(CURRICULUM_FILE_NAME));
-    Objects.requireNonNull(System.getProperty(VERSION_DATE));
-    Objects.requireNonNull(System.getProperty(LANGUAGES));
-
-    final String projectVersion = System.getProperty(PROJECT_VERSION);
-    final String curriculumFileName = System.getProperty(CURRICULUM_FILE_NAME);
-    final String versionDate = System.getProperty(VERSION_DATE);
-    final String[] languages = System.getProperty(LANGUAGES).split(LANGUAGE_SEPERATOR);
-
-    Stream.of(languages).forEach(language -> convertInLanguage(
-        language,
-        projectVersion,
-        curriculumFileName,
-        versionDate,
-        curriculumFileName
-    ));
-
-    convertInFormat(HTML,
-        projectVersion,
-        INDEX_FILE_NAME,
-        versionDate,
-        ENGLISH,
-        curriculumFileName);
-  }
-
-  private static void convertInLanguage(
-      final String language,
-      final String projectVersion,
-      final String curriculumFileName,
-      final String versionDate,
-      final String curriculumName) {
-    Stream.of(FORMATS).forEach(format -> convertInFormat(
-        format, projectVersion,
-        curriculumFileName,
-        versionDate,
-        language,
-        curriculumName
-    ));
-  }
-
-  private static void convertInFormat(
-      final String format,
-      final String projectVersion,
-      final String curriculumFileName,
-      final String versionDate,
-      final String language,
-      final String curriculumName) {
-    try (final Asciidoctor asciidoctor = create()) {
-      final Attributes attributes = toAttributes(
-          projectVersion,
-          curriculumName,
-          versionDate,
-          language);
-      asciidoctor.convertDirectory(
-          List.of(new File("%s%s.%s".formatted(
-              SOURCE_DIR,
-              curriculumFileName,
-              ADOC))),
-          Options.builder()
-              .baseDir(new File(BASE_DIR))
-              .backend(toBackend(format))
-              .mkDirs(true)
-              .attributes(attributes)
-              .standalone(true)
-              .toDir(new File(OUTPUT_DIR))
-              .safe(SafeMode.UNSAFE)
-              .build());
-
-      if (!INDEX_FILE_NAME.equals(curriculumFileName)) {
-        // rename only if we're not creating the index file.
-        renameResultAccordingToLanguage(curriculumFileName, format, language);
-      }
-    }
-  }
-
-  private static Attributes toAttributes(
-      final String projectVersion,
-      final String curriculumFileName,
-      final String versionDate,
-      final String language) {
-    final String fileVersion = "%s-%s".formatted(projectVersion, language);
-    final String documentVersion = "%s-%s".formatted(fileVersion, versionDate);
-
-    final Map<String, Object> attributes = new HashMap<>() {{
-      put("icons", "font");
-      put("version-label", "");
-      put("revnumber", fileVersion);
-      put("revdate", versionDate);
-      put("document-version", documentVersion);
-      put("currentDate", versionDate);
-      put("language", language);
-      put("curriculumFileName", curriculumFileName);
-      put("pdf-themesdir", "../pdf-theme/themes");
-      put("pdf-fontsdir", "../pdf-theme/fonts");
-      put("pdf-theme", "isaqb");
-      put("stylesheet", "../html-theme/adoc-github.css");
-      put("stylesheet-dir", "../html-theme");
-      put("data-uri", true);
-      put("allow-uri-read", true);
-    }};
-
-    return Attributes.builder().attributes(attributes).build();
-  }
-
-  private static String toBackend(final String format) {
-    return switch (format) {
-      case HTML -> HTML5;
-      case PDF -> PDF;
-      default -> throw new IllegalArgumentException("Unknown target format %s".formatted(format));
-    };
-  }
-
-  private static void renameResultAccordingToLanguage(
-      final String fileName,
-      final String format,
-      final String language) {
-    final File original = new File("%s%s.%s".formatted(OUTPUT_DIR, fileName, format));
-        final File renamed = new File("%s%s-%s.%s".formatted(OUTPUT_DIR, fileName, language.toLowerCase(), format));
-    if (!original.exists()) {
-            System.err.printf("Failed to rename result file %s as it does not exist", original.getAbsolutePath());
-    } else if (!original.renameTo(renamed)) {
-            System.err.printf("Failed to rename result file %s to %s%n", original.getName(), renamed.getName());
-    }
-    original.deleteOnExit();
-  }
-}