diff --git a/.github/workflows/deploy_docs_4x.yml b/.github/workflows/deploy_docs_4x.yml
new file mode 100644
index 00000000..4e982134
--- /dev/null
+++ b/.github/workflows/deploy_docs_4x.yml
@@ -0,0 +1,23 @@
+---
+name: 'deploy_docs_4x'
+
+on:
+  push:
+    branches:
+      - 4.x
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Cloning repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Push to dokku
+        uses: dokku/github-action@master
+        with:
+          git_remote_url: 'ssh://dokku@apps.cakephp.org:22/migrations-docs-4'
+          ssh_private_key: ${{ secrets.DOKKU_SSH_PRIVATE_KEY }}
diff --git a/Dockerfile b/Dockerfile
index 478f14c7..70ceb413 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # Basic docker based environment
 # Necessary to trick dokku into building the documentation
 # using dockerfile instead of herokuish
-FROM ubuntu:17.04
+FROM ubuntu:22.04
 
 # Add basic tools
 RUN apt-get update && \
@@ -14,7 +14,7 @@ RUN apt-get update && \
     libssl-dev && \
   LC_ALL=C.UTF-8 add-apt-repository ppa:ondrej/php && \
   apt-get update && \
-  apt-get install -y php7.2-cli php7.2-mbstring php7.2-xml php7.2-zip php7.2-intl php7.2-opcache php7.2-sqlite &&\
+  apt-get install -y php8.1-cli php8.1-mbstring php8.1-xml php8.1-zip php8.1-intl php8.1-opcache php8.1-sqlite &&\
   apt-get clean &&\
   rm -rf /var/lib/apt/lists/*
 
diff --git a/README.md b/README.md
index 2d8199fe..88dbc776 100644
--- a/README.md
+++ b/README.md
@@ -41,4 +41,4 @@ Additionally, you will need to configure the ``default`` database configuration
 
 ## Documentation
 
-Full documentation of the plugin can be found on the [CakePHP Cookbook](https://book.cakephp.org/migrations/3/).
+Full documentation of the plugin can be found on the [CakePHP Cookbook](https://book.cakephp.org/migrations/4/).
diff --git a/docs.Dockerfile b/docs.Dockerfile
index 905d56dd..0b6aefb8 100644
--- a/docs.Dockerfile
+++ b/docs.Dockerfile
@@ -12,7 +12,7 @@ FROM ghcr.io/cakephp/docs-builder:runtime as runtime
 
 ENV LANGS="en fr ja pt ru"
 ENV SEARCH_SOURCE="/usr/share/nginx/html"
-ENV SEARCH_URL_PREFIX="/migrations/3"
+ENV SEARCH_URL_PREFIX="/migrations/4"
 
 COPY --from=builder /data/docs /data/docs
 COPY --from=builder /data/website /data/website
diff --git a/docs/config/all.py b/docs/config/all.py
index 68ab4555..e3339bd2 100644
--- a/docs/config/all.py
+++ b/docs/config/all.py
@@ -10,10 +10,10 @@
 #
 
 # The full version, including alpha/beta/rc tags.
-release = '3.x'
+release = '4.x'
 
 # The search index version.
-search_version = 'migrations-3'
+search_version = 'migrations-4'
 
 # The marketing display name for the book.
 version_name = ''
@@ -24,7 +24,8 @@
 # Other versions that display in the version picker menu.
 version_list = [
     {'name': '2.x', 'number': 'migrations/2', 'title': '2.x'},
-    {'name': '3.x', 'number': 'migrations/3', 'title': '3.x', 'current': True},
+    {'name': '3.x', 'number': 'migrations/3', 'title': '3.x'},
+    {'name': '4.x', 'number': 'migrations/4', 'title': '4.x', 'current': True},
 ]
 
 # Languages available.
@@ -32,10 +33,10 @@
 
 # The GitHub branch name for this version of the docs
 # for edit links to point at.
-branch = '3.x'
+branch = '4.x'
 
 # Current version being built
-version = '3.x'
+version = '4.x'
 
 # Language in use for this directory.
 language = 'en'