diff --git a/composer.json b/composer.json
index ddb9f470..9b53625d 100644
--- a/composer.json
+++ b/composer.json
@@ -18,14 +18,15 @@
   },
   "require-dev": {
     "wp-cli/scaffold-command": "^1 || ^2",
-    "wp-cli/wp-cli-tests": "^4"
+    "wp-cli/wp-cli-tests": "^5"
   },
   "config": {
     "process-timeout": 7200,
     "sort-packages": true,
     "allow-plugins": {
       "dealerdirect/phpcodesniffer-composer-installer": true,
-      "johnpbloch/wordpress-core-installer": true
+      "johnpbloch/wordpress-core-installer": true,
+      "phpstan/extension-installer": true
     },
     "lock": false
   },
@@ -58,12 +59,14 @@
     "behat-rerun": "rerun-behat-tests",
     "lint": "run-linter-tests",
     "phpcs": "run-phpcs-tests",
+    "phpstan": "run-phpstan-tests",
     "phpcbf": "run-phpcbf-cleanup",
     "phpunit": "run-php-unit-tests",
     "prepare-tests": "install-package-tests",
     "test": [
       "@lint",
       "@phpcs",
+      "@phpstan",
       "@phpunit",
       "@behat"
     ]
diff --git a/tests/JsonManipulatorTest.php b/tests/JsonManipulatorTest.php
index 026f7bec..156ab7f9 100644
--- a/tests/JsonManipulatorTest.php
+++ b/tests/JsonManipulatorTest.php
@@ -12,6 +12,7 @@
 
 use WP_CLI\JsonManipulator; // WP_CLI
 use WP_CLI\Tests\TestCase;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 class JsonManipulatorTest extends TestCase
 {
@@ -19,6 +20,7 @@ class JsonManipulatorTest extends TestCase
     /**
      * @dataProvider linkProvider
      */
+	#[DataProvider( 'linkProvider' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testAddLink($json, $type, $package, $constraint, $expected)
     {
         $manipulator = new JsonManipulator($json);
@@ -1290,6 +1292,7 @@ public static function linkProvider()
     /**
      * @dataProvider providerAddLinkAndSortPackages
      */
+	#[DataProvider( 'providerAddLinkAndSortPackages' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testAddLinkAndSortPackages($json, $type, $package, $constraint, $sortPackages, $expected)
     {
         $manipulator = new JsonManipulator($json);
@@ -1370,6 +1373,7 @@ public static function providerAddLinkAndSortPackages()
     /**
      * @dataProvider removeSubNodeProvider
      */
+	#[DataProvider( 'removeSubNodeProvider' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testRemoveSubNode($json, $name, $expected, $expectedContent = null)
     {
         $manipulator = new JsonManipulator($json);
@@ -1601,10 +1605,6 @@ public static function removeSubNodeProvider()
         }
     }
 }
-',
-
-                '{
-}
 ',
             ),
             'works on deep repos with borked texts2' => array(
@@ -1624,10 +1624,6 @@ public static function removeSubNodeProvider()
         }
     }
 }
-',
-
-                '{
-}
 ',
             ),
             'fails on deep arrays with borked texts' => array(
@@ -2367,6 +2363,7 @@ public function testRemoveMainKeyAtEndOfFile()
     /**
      * @dataProvider providerAddLinkCaseInsensitive
      */
+	#[DataProvider( 'providerAddLinkCaseInsensitive' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testAddLinkCaseInsensitive($json, $type, $package, $constraint, $sortPackages, $expected)
     {
         $manipulator = new JsonManipulator($json);
@@ -2433,6 +2430,7 @@ public static function providerAddLinkCaseInsensitive()
     /**
      * @dataProvider providerAddSubNodeCase
      */
+	#[DataProvider( 'providerAddSubNodeCase' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testAddSubNodeCase($json, $mainNode, $name, $caseInsensitive, $expected)
     {
         $manipulator = new JsonManipulator($json);
@@ -2494,6 +2492,7 @@ public static function providerAddSubNodeCase()
     /**
      * @dataProvider providerRemoveSubNodeCaseInsensitive
      */
+	#[DataProvider( 'providerRemoveSubNodeCaseInsensitive' )] // phpcs:ignore PHPCompatibility.Attributes.NewAttributes.PHPUnitAttributeFound
     public function testRemoveSubNodeCaseInsensitive($json, $mainNode, $name, $expected, $expectedContent = null)
     {
         $manipulator = new JsonManipulator($json);