diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index aace3d6..e38e579 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,8 +5,8 @@ on:
   pull_request:
   workflow_dispatch:
   schedule:
-    # “At 17:45 on Friday.”
-    - cron:  '45 17 * * 5'
+    # “At 12:00 on Wednesdays.”
+    - cron:  '0 12 * * 3'
 
 jobs:
   build:
@@ -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']
+        php-version: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
 
     steps:
       - uses: actions/checkout@v3
diff --git a/README.md b/README.md
index 6ad7a77..7dc029a 100644
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@
 <a href="https://github.com/rboonzaijer/php-array-to-xml/actions/workflows/tests.yml"><img src="https://shields.io/badge/style-8.0-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-8.1-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>
 
 </p>
 
diff --git a/tests/phpunit-8.3.xml b/tests/phpunit-8.3.xml
new file mode 100644
index 0000000..206f4e4
--- /dev/null
+++ b/tests/phpunit-8.3.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>