diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 271c396..a89ecd8 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -18,6 +18,7 @@ jobs:
                 include:
                     - { php-version: 8.1, symfony-locked-version: 5.4.*, dependency-version: prefer-stable }
                     - { php-version: 8.1, symfony-locked-version: 6.4.*, dependency-version: prefer-stable }
+                    - { php-version: 8.3, symfony-locked-version: 6.4.*, dependency-version: prefer-stable }
         name: PHPUnit (PHP ${{matrix.php-version}}, Symfony Version Lock ${{ matrix.symfony-locked-version }}, ${{ matrix.dependency-version }})
         steps:
             -   uses: actions/checkout@v4
diff --git a/composer.json b/composer.json
index 5878c0a..6e3dee2 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         }
     ],
     "require": {
-        "php": "8.1.*",
+        "php": "8.1.*|8.3.*",
         "ext-intl": "*",
         "lib-icu": ">=4.8",
         "jms/parser-lib": "^1.0.0",