diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 0b65695..14162d5 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -26,6 +26,8 @@ jobs:
           - php: '8.1'
           - php: '8.2'
           - php: '8.3'
+          - php: '8.4'
+          - php: '8.5'
       fail-fast: false
 
     steps:
diff --git a/composer.json b/composer.json
index 40eda1c..cd23c95 100644
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
     ],
     "require": {
         "php": ">=7.0",
-        "symfony/intl": "~2.6|~3.4|~4.0|~5.0|~6.0|~7.0"
+        "symfony/intl": "~2.6|~3.4|~4.0|~5.0|~6.0|~7.0|~8.0"
     },
     "suggest": {
         "ext-intl": "Needed for usage with other locales than 'en'"
diff --git a/test/RangerTest.php b/test/RangerTest.php
index 23f955d..ce89c7c 100644
--- a/test/RangerTest.php
+++ b/test/RangerTest.php
@@ -10,6 +10,7 @@
 use IntlDateFormatter;
 use DateTime;
 use DateTimeImmutable;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 
 class RangerTest extends TestCase
@@ -17,6 +18,7 @@ class RangerTest extends TestCase
     /**
      * @dataProvider providerDateRange
      */
+    #[DataProvider('providerDateRange')]
     public function testDateRange($language, $start, $end, $expected)
     {
         $formatter = new Ranger($language);
@@ -38,6 +40,7 @@ public static function providerDateRange()
     /**
      * @dataProvider providerDateTimeRange
      */
+    #[DataProvider('providerDateTimeRange')]
     public function testDateTimeRange($language, $start, $end, $expected)
     {
         $formatter = new Ranger($language);
@@ -67,6 +70,7 @@ public static function providerDateTimeRange()
     /**
      * @dataProvider providerFullDateRange
      */
+    #[DataProvider('providerFullDateRange')]
     public function testFullDateRange($language, $start, $end, $expected)
     {
         $formatter = new Ranger($language);
@@ -89,6 +93,7 @@ public static function providerFullDateRange()
     /**
      * @dataProvider providerShortDateRange
      */
+    #[DataProvider('providerShortDateRange')]
     public function testShortDateRange($language, $start, $end, $expected)
     {
         $formatter = new Ranger($language);
@@ -199,6 +204,7 @@ public function testOffsetTimezone()
     /**
      * @dataProvider providerNoDate
      */
+    #[DataProvider('providerNoDate')]
     public function testNoDate($language, $start, $end, $expected)
     {
         $formatter = new Ranger($language);