diff --git a/composer.json b/composer.json
index cf4c4d108..4e0202817 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         "silverstripe/admin": "^3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^11.3",
         "silverstripe/frameworktest": "^2",
         "squizlabs/php_codesniffer": "^3.7",
         "silverstripe/cms": "^6",
diff --git a/tests/php/Controller/AssetAdminOpenTest.php b/tests/php/Controller/AssetAdminOpenTest.php
index 2160e0387..e369bc6fd 100644
--- a/tests/php/Controller/AssetAdminOpenTest.php
+++ b/tests/php/Controller/AssetAdminOpenTest.php
@@ -9,6 +9,7 @@
 use SilverStripe\Assets\Folder;
 use SilverStripe\Assets\File;
 use SilverStripe\Versioned\Versioned;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class AssetAdminOpenTest extends FunctionalTest
 {
@@ -44,7 +45,7 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
-    public function provideApiRead(): array
+    public static function provideApiRead(): array
     {
         return [
             'Valid' => [
@@ -138,9 +139,7 @@ public function provideApiRead(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiRead
-     */
+    #[DataProvider('provideApiRead')]
     public function testApiRead(
         string $idType,
         string $fail,
diff --git a/tests/php/Controller/AssetAdminTest.php b/tests/php/Controller/AssetAdminTest.php
index cac758ea5..00458aee5 100644
--- a/tests/php/Controller/AssetAdminTest.php
+++ b/tests/php/Controller/AssetAdminTest.php
@@ -20,6 +20,7 @@
 use SilverStripe\Security\SecurityToken;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\AssetAdmin\Tests\Controller\AssetAdminTest\FilesInUseFileExtension;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 /**
  * Tests {@see AssetAdmin}
@@ -473,7 +474,7 @@ public function testGetClientConfigExtensions()
         });
     }
 
-    public function provideApiReadDescendantCounts(): array
+    public static function provideApiReadDescendantCounts(): array
     {
         return [
             'Valid' => [
@@ -514,9 +515,7 @@ public function provideApiReadDescendantCounts(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiReadDescendantCounts
-     */
+    #[DataProvider('provideApiReadDescendantCounts')]
     public function testApiReadDescendantCounts(
         string $idsType,
         string $fail,
@@ -556,7 +555,7 @@ public function testApiReadDescendantCounts(
         }
     }
 
-    public function provideApiReadLiveOwnerCounts(): array
+    public static function provideApiReadLiveOwnerCounts(): array
     {
         return [
             'Valid' => [
@@ -597,9 +596,7 @@ public function provideApiReadLiveOwnerCounts(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiReadLiveOwnerCounts
-     */
+    #[DataProvider('provideApiReadLiveOwnerCounts')]
     public function testApiReadLiveOwnerCounts(
         string $idsType,
         string $fail,
@@ -651,7 +648,7 @@ public function testApiReadLiveOwnerCounts(
         }
     }
 
-    public function provideApiReadUsage(): array
+    public static function provideApiReadUsage(): array
     {
         return [
             'Valid' => [
@@ -682,9 +679,7 @@ public function provideApiReadUsage(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiReadUsage
-     */
+    #[DataProvider('provideApiReadUsage')]
     public function testApiReadUsage(
         string $idType,
         string $fail,
@@ -708,7 +703,7 @@ public function testApiReadUsage(
         }
     }
 
-    public function provideApiDelete(): array
+    public static function provideApiDelete(): array
     {
         return [
             'Valid' => [
@@ -759,9 +754,7 @@ public function provideApiDelete(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiDelete
-     */
+    #[DataProvider('provideApiDelete')]
     public function testApiDelete(
         string $idsType,
         string $fail,
@@ -797,7 +790,7 @@ public function testApiDelete(
         }
     }
 
-    public function provideApiMove(): array
+    public static function provideApiMove(): array
     {
         return [
             'Valid' => [
@@ -858,9 +851,7 @@ public function provideApiMove(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiMove
-     */
+    #[DataProvider('provideApiMove')]
     public function testApiMove(
         string $idsType,
         string $fail,
@@ -910,7 +901,7 @@ public function testApiMove(
         }
     }
 
-    public function provideApiPublish(): array
+    public static function provideApiPublish(): array
     {
         return [
             'Valid' => [
@@ -961,9 +952,7 @@ public function provideApiPublish(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiPublish
-     */
+    #[DataProvider('provideApiPublish')]
     public function testApiPublish(
         string $idsType,
         string $fail,
@@ -1013,7 +1002,7 @@ public function testApiPublish(
         }
     }
 
-    public function provideApiUnpublish(): array
+    public static function provideApiUnpublish(): array
     {
         return [
             'Valid' => [
@@ -1064,9 +1053,7 @@ public function provideApiUnpublish(): array
         ];
     }
 
-    /**
-     * @dataProvider provideApiUnpublish
-     */
+    #[DataProvider('provideApiUnpublish')]
     public function testApiUnpublish(
         string $idsType,
         string $fail,
diff --git a/tests/php/Forms/RemoteFileFormFactoryTest.php b/tests/php/Forms/RemoteFileFormFactoryTest.php
index 5c7df1370..f0f96a7c7 100644
--- a/tests/php/Forms/RemoteFileFormFactoryTest.php
+++ b/tests/php/Forms/RemoteFileFormFactoryTest.php
@@ -9,6 +9,7 @@
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Forms\Form;
 use SilverStripe\View\Embed\Embeddable;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class RemoteFileFormFactoryTest extends SapphireTest
 {
@@ -33,7 +34,7 @@ protected function setUp(): void
         ]);
     }
 
-    public function providerTestAcceptedURLs()
+    public static function providerTestAcceptedURLs()
     {
         return [
             [
@@ -74,10 +75,10 @@ public function providerTestAcceptedURLs()
     }
 
     /**
-     * @dataProvider providerTestAcceptedURLs
      * @param array $config Config to merge
      * @param string $acceptedURL OK url
      */
+    #[DataProvider('providerTestAcceptedURLs')]
     public function testAcceptedURLs($config, $acceptedURL)
     {
         foreach ($config as $key => $value) {
@@ -93,7 +94,7 @@ public function testAcceptedURLs($config, $acceptedURL)
         $this->assertInstanceOf(Form::class, $fields);
     }
 
-    public function providerTestRejectedURLs()
+    public static function providerTestRejectedURLs()
     {
         return [
             [
@@ -140,11 +141,11 @@ public function providerTestRejectedURLs()
     }
 
     /**
-     * @dataProvider providerTestRejectedURLs
      * @param array $config Config to merge
      * @param string $rejectedURL rejected url
      * @param string $rejectedMessage
      */
+    #[DataProvider('providerTestRejectedURLs')]
     public function testRejectedURLS($config, $rejectedURL)
     {
         $this->expectException(InvalidRemoteUrlException::class);
diff --git a/tests/php/Forms/UploadFieldTest.php b/tests/php/Forms/UploadFieldTest.php
index 7ba65c160..a6a87ebd1 100644
--- a/tests/php/Forms/UploadFieldTest.php
+++ b/tests/php/Forms/UploadFieldTest.php
@@ -15,6 +15,7 @@
 use SilverStripe\Forms\FieldList;
 use SilverStripe\Forms\Form;
 use SilverStripe\ORM\ArrayList;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class UploadFieldTest extends SapphireTest
 {
@@ -47,7 +48,7 @@ protected function tearDown(): void
         parent::tearDown();
     }
 
-    public function provideGetUploadMaxFileSize(): array
+    public static function provideGetUploadMaxFileSize(): array
     {
         return [
             [
@@ -61,9 +62,7 @@ public function provideGetUploadMaxFileSize(): array
         ];
     }
 
-    /**
-     * @dataProvider provideGetUploadMaxFileSize
-     */
+    #[DataProvider('provideGetUploadMaxFileSize')]
     public function testGetUploadMaxFileSize(?int $adminMaxFileSize, int $expected): void
     {
         Upload_Validator::config()->set('default_max_file_size', ['*' => 100]);
diff --git a/tests/php/Model/ThumbnailGeneratorTest.php b/tests/php/Model/ThumbnailGeneratorTest.php
index 259e96713..c5eb033f6 100644
--- a/tests/php/Model/ThumbnailGeneratorTest.php
+++ b/tests/php/Model/ThumbnailGeneratorTest.php
@@ -9,6 +9,7 @@
 use Silverstripe\Assets\Dev\TestAssetStore;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Dev\SapphireTest;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class ThumbnailGeneratorTest extends SapphireTest
 {
@@ -117,7 +118,7 @@ public function testGenerateLink()
         $this->assertEquals('/assets/906835357d/TestImage__FitMaxWzEwMCwyMDBd.png', $thumbnail);
     }
 
-    public function provideAnimatedThumbnail(): array
+    public static function provideAnimatedThumbnail(): array
     {
         return [
             [true],
@@ -125,9 +126,7 @@ public function provideAnimatedThumbnail(): array
         ];
     }
 
-    /**
-     * @dataProvider provideAnimatedThumbnail
-     */
+    #[DataProvider('provideAnimatedThumbnail')]
     public function testAnimatedThumbnail(bool $allowAnimation): void
     {
         $image = new Image();