diff --git a/composer.lock b/composer.lock
index 04ff0c5..ec6ae72 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1496,20 +1496,20 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.12.7",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0"
+                "reference": "72115ab2bf1e40af1f9b238938d493ba7f3221e7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/72115ab2bf1e40af1f9b238938d493ba7f3221e7",
+                "reference": "72115ab2bf1e40af1f9b238938d493ba7f3221e7",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2|^8.0"
+                "php": "^7.4|^8.0"
             },
             "conflict": {
                 "phpstan/phpstan-shim": "*"
@@ -1550,34 +1550,33 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-10-18T11:12:07+00:00"
+            "time": "2024-11-11T07:06:55+00:00"
         },
         {
             "name": "phpstan/phpstan-phpunit",
-            "version": "1.4.0",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan-phpunit.git",
-                "reference": "f3ea021866f4263f07ca3636bf22c64be9610c11"
+                "reference": "3cc855474263ad6220dfa49167cbea34ca1dd300"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/f3ea021866f4263f07ca3636bf22c64be9610c11",
-                "reference": "f3ea021866f4263f07ca3636bf22c64be9610c11",
+                "url": "https://api.github.com/repos/phpstan/phpstan-phpunit/zipball/3cc855474263ad6220dfa49167cbea34ca1dd300",
+                "reference": "3cc855474263ad6220dfa49167cbea34ca1dd300",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2 || ^8.0",
-                "phpstan/phpstan": "^1.11"
+                "php": "^7.4 || ^8.0",
+                "phpstan/phpstan": "^2.0"
             },
             "conflict": {
                 "phpunit/phpunit": "<7.0"
             },
             "require-dev": {
-                "nikic/php-parser": "^4.13.0",
                 "php-parallel-lint/php-parallel-lint": "^1.2",
-                "phpstan/phpstan-strict-rules": "^1.5.1",
-                "phpunit/phpunit": "^9.5"
+                "phpstan/phpstan-strict-rules": "^2.0",
+                "phpunit/phpunit": "^9.6"
             },
             "type": "phpstan-extension",
             "extra": {
@@ -1600,9 +1599,9 @@
             "description": "PHPUnit extensions and rules for PHPStan",
             "support": {
                 "issues": "https://github.com/phpstan/phpstan-phpunit/issues",
-                "source": "https://github.com/phpstan/phpstan-phpunit/tree/1.4.0"
+                "source": "https://github.com/phpstan/phpstan-phpunit/tree/2.0.0"
             },
-            "time": "2024-04-20T06:39:00+00:00"
+            "time": "2024-10-14T03:16:27+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -4269,7 +4268,6 @@
         "friendsofphp/php-cs-fixer": 0,
         "phpstan/extension-installer": 0,
         "phpstan/phpstan": 0,
-        "phpstan/phpstan-phpunit": 0,
         "phpunit/phpunit": 0
     },
     "prefer-stable": false,
diff --git a/src/Differ/DiffCollector.php b/src/Differ/DiffCollector.php
index 57f0973..cacee46 100644
--- a/src/Differ/DiffCollector.php
+++ b/src/Differ/DiffCollector.php
@@ -80,7 +80,7 @@ public function getPhpDiffs(bool $includeNonAstChanged = true): array
     /**
      * Get the non-PHP diffs.
      *
-     * @return array<Diff> the array of non-PHP diffs
+     * @return list<Diff> the array of non-PHP diffs
      */
     public function getNonPhpDiffs(): array
     {
diff --git a/tests/unit/Differ/DiffFactoryTest.php b/tests/unit/Differ/DiffFactoryTest.php
index 5504759..943e9b5 100644
--- a/tests/unit/Differ/DiffFactoryTest.php
+++ b/tests/unit/Differ/DiffFactoryTest.php
@@ -7,7 +7,6 @@
 use O0h\PhpAstCheckDiff\Differ\DiffFactory;
 use O0h\PhpAstCheckDiff\Differ\Port\AstHasherInterface;
 use O0h\PhpAstCheckDiff\Differ\Port\GitInterface;
-use O0h\PhpAstCheckDiff\Value\Diff;
 use O0h\PhpAstCheckDiff\Value\GitStatus;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
@@ -28,7 +27,6 @@ public function testCreateForNonPhp(): void
 
         $diff = $subject->createForNonPhp($path, $status);
 
-        $this->assertInstanceOf(Diff::class, $diff);
         $this->assertSame($path, $diff->path);
         $this->assertSame($status, $diff->status);
     }