diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..503673eb
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,5 @@
+.git
+.gitignore
+vendor
+.env
+xdebug.log
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 00000000..7e8841eb
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,23 @@
+FROM php:8.4-cli
+
+RUN apt-get update && apt-get install -y \
+    libcurl4-openssl-dev \
+    libonig-dev \
+    unzip \
+    && docker-php-ext-install mbstring curl
+
+RUN pecl install xdebug && docker-php-ext-enable xdebug
+
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+WORKDIR /var/www/html
+
+COPY src src
+COPY Tests Tests
+COPY Samples Samples
+COPY composer.json composer.json
+COPY phpunit.xml.dist phpunit.xml.dist
+COPY .php-cs-fixer.php .php-cs-fixer.php
+COPY php.ini /usr/local/etc/php/php.ini
+
+RUN composer install --no-interaction
diff --git a/README.md b/README.md
index f64c0315..4153afab 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,27 @@ A PHP library implementing the following functions of the FinTS/HBCI protocol:
 
 Forked from [mschindler83/fints-hbci-php](https://github.com/mschindler83/fints-hbci-php), but then mostly reimplemented.
 
+## Docker
+
+A Docker environment with PHP 8.4, xDebug, and all dependencies is available.
+
+```bash
+docker compose up -d
+docker compose exec app composer install
+```
+
+Run tests inside the container:
+
+```bash
+docker compose exec app composer test
+```
+
+Work inside the container:
+
+```bash
+docker compose exec app composer bash
+```
+
 ## Getting Started
 
 Before using this library (or any other FinTS library), you have to register your application with
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 00000000..235bff1e
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,7 @@
+services:
+  app:
+    build: .
+    volumes:
+      - .:/var/www/html:rw
+    stdin_open: true
+    tty: true
diff --git a/php.ini b/php.ini
new file mode 100644
index 00000000..0ba945ab
--- /dev/null
+++ b/php.ini
@@ -0,0 +1,12 @@
+[PHP]
+memory_limit = 256M
+display_errors = On
+display_startup_errors = On
+error_reporting = E_ALL
+
+[xdebug]
+xdebug.mode = debug
+xdebug.start_with_request = yes
+xdebug.client_host = host.docker.internal
+xdebug.client_port = 9003
+xdebug.log = /var/www/html/xdebug.log