diff --git a/.docker/Dockerfile-php8.4 b/.docker/Dockerfile-php8.4
new file mode 100644
index 0000000..3770f32
--- /dev/null
+++ b/.docker/Dockerfile-php8.4
@@ -0,0 +1,8 @@
+FROM php:8.4-cli-alpine
+
+COPY ./../.. /usr/src/myapp
+WORKDIR /usr/src/myapp
+
+RUN apk --no-cache add curl zip
+RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+RUN composer install
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8149f75..c2b78c6 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
+        php-version: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
 
     steps:
       - uses: actions/checkout@v4
diff --git a/README.md b/README.md
index 5bc9890..66afc0a 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,7 @@
 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.1-green?label=php&style=flat-square"></a>
 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.2-green?label=php&style=flat-square"></a>
 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.3-green?label=php&style=flat-square"></a>
+<a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.4-green?label=php&style=flat-square"></a>
 
 </p>
 
diff --git a/docker-compose.yml b/docker-compose.yml
index ad28a60..013e9c3 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,7 +1,10 @@
-version: "3"
-
 services:
 
+  php8.4:
+    build:
+      context: .
+      dockerfile: .docker/Dockerfile-php8.4
+
   php8.3:
     build:
       context: .
diff --git a/docker-run-tests.sh b/docker-run-tests.sh
index ea0e3d7..1518ede 100755
--- a/docker-run-tests.sh
+++ b/docker-run-tests.sh
@@ -7,4 +7,5 @@ docker compose run --rm php8.0 php ./vendor/bin/phpunit -c tests/phpunit-8.0.xml
 docker compose run --rm php8.1 php ./vendor/bin/phpunit -c tests/phpunit-8.1.xml && \
 docker compose run --rm php8.2 php ./vendor/bin/phpunit -c tests/phpunit-8.2.xml && \
 docker compose run --rm php8.3 php ./vendor/bin/phpunit -c tests/phpunit-8.3.xml && \
+docker compose run --rm php8.4 php ./vendor/bin/phpunit -c tests/phpunit-8.4.xml && \
 echo -e "\n\ndone.\n"
diff --git a/tests/phpunit-8.4.xml b/tests/phpunit-8.4.xml
new file mode 100644
index 0000000..206f4e4
--- /dev/null
+++ b/tests/phpunit-8.4.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- PHPUnit 10	>= PHP 8.1 (https://phpunit.de/supported-versions.html) -->
+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+        backupGlobals="false" 
+        bootstrap="./../vendor/autoload.php" 
+        colors="true" 
+        processIsolation="false" 
+        stopOnFailure="false" 
+        cacheResult="false" 
+        xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" 
+        cacheDirectory=".phpunit.cache" 
+        backupStaticProperties="false">
+  <testsuites>
+    <testsuite name="PhpArrayToXml Test Suite">
+      <directory>./../tests/</directory>
+    </testsuite>
+  </testsuites>
+  <source>
+    <include>
+      <directory>./../src</directory>
+    </include>
+    <exclude>
+      <directory>./../vendor</directory>
+      <directory>./../tests</directory>
+    </exclude>
+  </source>
+</phpunit>