diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bed8493..84c5bae 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -2,43 +2,48 @@ name: Tests
 
 on:
   push:
-    branches: [ main, develop, 4.x ]
+    branches:
+      - main
+      - develop
+      - 4.x
   pull_request:
-    branches: [ main, develop, 4.x ]
+    branches:
+      - main
+      - develop
+      - 4.x
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     strategy:
       fail-fast: true
       matrix:
-        php: [8.2, 8.3, 8.4]
-        laravel: [11]
+        php: [ 8.2, 8.3, 8.4 ]
+        laravel: [ 11, 12 ]
 
     steps:
-    - name: Checkout Code
-      uses: actions/checkout@v3
-
-    - name: Setup PHP
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: ${{ matrix.php }}
-        extensions: dom, curl, libxml, mbstring, zip
-        tools: composer:v2
-        coverage: none
-        ini-values: error_reporting=E_ALL, zend.assertions=1
-
-    - name: Set Laravel Version
-      run: composer require "illuminate/contracts:^${{ matrix.laravel }}" --no-update
-
-    - name: Install dependencies
-      uses: nick-fields/retry@v2
-      with:
-        timeout_minutes: 5
-        max_attempts: 5
-        command: composer update --prefer-dist --no-interaction --no-progress
-
-    - name: Execute tests
-      run: vendor/bin/phpunit
+      - name: Checkout Code
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip
+          tools: composer:v2
+          coverage: none
+          ini-values: error_reporting=E_ALL, zend.assertions=1
+
+      - name: Set Laravel Version
+        run: composer require "illuminate/contracts:^${{ matrix.laravel }}" --no-update
+
+      - name: Install dependencies
+        uses: nick-fields/retry@v2
+        with:
+          timeout_minutes: 5
+          max_attempts: 5
+          command: composer update --prefer-dist --no-interaction --no-progress
+
+      - name: Execute tests
+        run: vendor/bin/phpunit
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3587901..9b0c791 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,38 @@ All notable changes to this project will be documented in this file. This projec
 
 ## Unreleased
 
+## [5.2.0] - 2025-02-24
+
+### Added
+
+- Package now supports both Laravel 11 and 12.
+
+## [5.1.0] - 2025-01-23
+
+### Added
+
+- [#24](https://github.com/laravel-json-api/core/pull/24) Add `header` property to error source object.
+
+## [5.0.2] - 2025-01-11
+
+### Fixed
+
+- [#23](https://github.com/laravel-json-api/core/pull/23) Ensure relationship meta is included in paginated relationship
+  responses.
+
+## [5.0.1] - 2024-11-30
+
+### Fixed
+
+- Removed more PHP 8.4 deprecation notices.
+
+## [5.0.0] - 2024-11-29
+
+### Added
+
+- **BREAKING**: [#21](https://github.com/laravel-json-api/core/pull/21) The `Authorizer` contract now allows all methods
+  to return a `bool` or an Illuminate authorization response.
+
 ## [4.3.2] - 2024-11-30
 
 ### Fixed
diff --git a/composer.json b/composer.json
index cad7a51..bfbf592 100644
--- a/composer.json
+++ b/composer.json
@@ -25,9 +25,10 @@
     "require": {
         "php": "^8.2",
         "ext-json": "*",
-        "illuminate/contracts": "^11.0",
-        "illuminate/http": "^11.0",
-        "illuminate/support": "^11.0"
+        "illuminate/auth": "^11.0|^12.0",
+        "illuminate/contracts": "^11.0|^12.0",
+        "illuminate/http": "^11.0|^12.0",
+        "illuminate/support": "^11.0|^12.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^10.5"
@@ -45,7 +46,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-4.x": "4.x-dev"
+            "dev-develop": "5.x-dev"
         }
     },
     "minimum-stability": "stable",
diff --git a/src/Contracts/Auth/Authorizer.php b/src/Contracts/Auth/Authorizer.php
index 8c83b4d..2378e30 100644
--- a/src/Contracts/Auth/Authorizer.php
+++ b/src/Contracts/Auth/Authorizer.php
@@ -11,6 +11,7 @@
 
 namespace LaravelJsonApi\Contracts\Auth;
 
+use Illuminate\Auth\Access\Response;
 use Illuminate\Http\Request;
 
 interface Authorizer
@@ -20,45 +21,45 @@ interface Authorizer
      *
      * @param Request $request
      * @param string $modelClass
-     * @return bool
+     * @return bool|Response
      */
-    public function index(Request $request, string $modelClass): bool;
+    public function index(Request $request, string $modelClass): bool|Response;
 
     /**
      * Authorize the store controller action.
      *
      * @param Request $request
      * @param string $modelClass
-     * @return bool
+     * @return bool|Response
      */
-    public function store(Request $request, string $modelClass): bool;
+    public function store(Request $request, string $modelClass): bool|Response;
 
     /**
      * Authorize the show controller action.
      *
      * @param Request $request
      * @param object $model
-     * @return bool
+     * @return bool|Response
      */
-    public function show(Request $request, object $model): bool;
+    public function show(Request $request, object $model): bool|Response;
 
     /**
      * Authorize the update controller action.
      *
      * @param object $model
      * @param Request $request
-     * @return bool
+     * @return bool|Response
      */
-    public function update(Request $request, object $model): bool;
+    public function update(Request $request, object $model): bool|Response;
 
     /**
      * Authorize the destroy controller action.
      *
      * @param Request $request
      * @param object $model
-     * @return bool
+     * @return bool|Response
      */
-    public function destroy(Request $request, object $model): bool;
+    public function destroy(Request $request, object $model): bool|Response;
 
     /**
      * Authorize the show-related controller action.
@@ -66,9 +67,9 @@ public function destroy(Request $request, object $model): bool;
      * @param Request $request
      * @param object $model
      * @param string $fieldName
-     * @return bool
+     * @return bool|Response
      */
-    public function showRelated(Request $request, object $model, string $fieldName): bool;
+    public function showRelated(Request $request, object $model, string $fieldName): bool|Response;
 
     /**
      * Authorize the show-relationship controller action.
@@ -76,9 +77,9 @@ public function showRelated(Request $request, object $model, string $fieldName):
      * @param Request $request
      * @param object $model
      * @param string $fieldName
-     * @return bool
+     * @return bool|Response
      */
-    public function showRelationship(Request $request, object $model, string $fieldName): bool;
+    public function showRelationship(Request $request, object $model, string $fieldName): bool|Response;
 
     /**
      * Authorize the update-relationship controller action.
@@ -86,9 +87,9 @@ public function showRelationship(Request $request, object $model, string $fieldN
      * @param Request $request
      * @param object $model
      * @param string $fieldName
-     * @return bool
+     * @return bool|Response
      */
-    public function updateRelationship(Request $request, object $model, string $fieldName): bool;
+    public function updateRelationship(Request $request, object $model, string $fieldName): bool|Response;
 
     /**
      * Authorize the attach-relationship controller action.
@@ -96,9 +97,9 @@ public function updateRelationship(Request $request, object $model, string $fiel
      * @param Request $request
      * @param object $model
      * @param string $fieldName
-     * @return bool
+     * @return bool|Response
      */
-    public function attachRelationship(Request $request, object $model, string $fieldName): bool;
+    public function attachRelationship(Request $request, object $model, string $fieldName): bool|Response;
 
     /**
      * Authorize the detach-relationship controller action.
@@ -106,7 +107,7 @@ public function attachRelationship(Request $request, object $model, string $fiel
      * @param Request $request
      * @param object $model
      * @param string $fieldName
-     * @return bool
+     * @return bool|Response
      */
-    public function detachRelationship(Request $request, object $model, string $fieldName): bool;
+    public function detachRelationship(Request $request, object $model, string $fieldName): bool|Response;
 }
diff --git a/src/Core/Auth/Authorizer.php b/src/Core/Auth/Authorizer.php
index 31b4a8d..2347752 100644
--- a/src/Core/Auth/Authorizer.php
+++ b/src/Core/Auth/Authorizer.php
@@ -12,6 +12,7 @@
 namespace LaravelJsonApi\Core\Auth;
 
 use Illuminate\Contracts\Auth\Access\Gate;
+use Illuminate\Auth\Access\Response;
 use Illuminate\Http\Request;
 use LaravelJsonApi\Contracts\Auth\Authorizer as AuthorizerContract;
 use LaravelJsonApi\Contracts\Schema\Schema;
@@ -47,10 +48,10 @@ public function __construct(Gate $gate, JsonApiService $service)
     /**
      * @inheritDoc
      */
-    public function index(Request $request, string $modelClass): bool
+    public function index(Request $request, string $modelClass): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'viewAny',
                 $modelClass
             );
@@ -62,10 +63,10 @@ public function index(Request $request, string $modelClass): bool
     /**
      * @inheritDoc
      */
-    public function store(Request $request, string $modelClass): bool
+    public function store(Request $request, string $modelClass): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'create',
                 $modelClass
             );
@@ -77,10 +78,10 @@ public function store(Request $request, string $modelClass): bool
     /**
      * @inheritDoc
      */
-    public function show(Request $request, object $model): bool
+    public function show(Request $request, object $model): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'view',
                 $model
             );
@@ -92,10 +93,10 @@ public function show(Request $request, object $model): bool
     /**
      * @inheritDoc
      */
-    public function update(Request $request, object $model): bool
+    public function update(Request $request, object $model): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'update',
                 $model
             );
@@ -107,10 +108,10 @@ public function update(Request $request, object $model): bool
     /**
      * @inheritDoc
      */
-    public function destroy(Request $request, object $model): bool
+    public function destroy(Request $request, object $model): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'delete',
                 $model
             );
@@ -122,10 +123,10 @@ public function destroy(Request $request, object $model): bool
     /**
      * @inheritDoc
      */
-    public function showRelated(Request $request, object $model, string $fieldName): bool
+    public function showRelated(Request $request, object $model, string $fieldName): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'view' . Str::classify($fieldName),
                 $model
             );
@@ -137,7 +138,7 @@ public function showRelated(Request $request, object $model, string $fieldName):
     /**
      * @inheritDoc
      */
-    public function showRelationship(Request $request, object $model, string $fieldName): bool
+    public function showRelationship(Request $request, object $model, string $fieldName): bool|Response
     {
         return $this->showRelated($request, $model, $fieldName);
     }
@@ -145,10 +146,10 @@ public function showRelationship(Request $request, object $model, string $fieldN
     /**
      * @inheritDoc
      */
-    public function updateRelationship(Request $request, object $model, string $fieldName): bool
+    public function updateRelationship(Request $request, object $model, string $fieldName): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'update' . Str::classify($fieldName),
                 [$model, $this->createRelation($request, $fieldName)]
             );
@@ -160,10 +161,10 @@ public function updateRelationship(Request $request, object $model, string $fiel
     /**
      * @inheritDoc
      */
-    public function attachRelationship(Request $request, object $model, string $fieldName): bool
+    public function attachRelationship(Request $request, object $model, string $fieldName): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'attach' . Str::classify($fieldName),
                 [$model, $this->createRelation($request, $fieldName)]
             );
@@ -175,10 +176,10 @@ public function attachRelationship(Request $request, object $model, string $fiel
     /**
      * @inheritDoc
      */
-    public function detachRelationship(Request $request, object $model, string $fieldName): bool
+    public function detachRelationship(Request $request, object $model, string $fieldName): bool|Response
     {
         if ($this->mustAuthorize()) {
-            return $this->gate->check(
+            return $this->gate->inspect(
                 'detach' . Str::classify($fieldName),
                 [$model, $this->createRelation($request, $fieldName)]
             );
diff --git a/src/Core/Document/ErrorSource.php b/src/Core/Document/ErrorSource.php
index 0b84555..13ae81c 100644
--- a/src/Core/Document/ErrorSource.php
+++ b/src/Core/Document/ErrorSource.php
@@ -31,6 +31,11 @@ class ErrorSource implements Serializable
      */
     private ?string $parameter;
 
+    /**
+     * @var string|null
+     */
+    private ?string $header;
+
     /**
      * @param ErrorSource|array|null $value
      * @return ErrorSource
@@ -60,7 +65,8 @@ public static function fromArray(array $source): self
     {
         return new self(
             $source['pointer'] ?? null,
-            $source['parameter'] ?? null
+            $source['parameter'] ?? null,
+            $source['header'] ?? null,
         );
     }
 
@@ -69,11 +75,13 @@ public static function fromArray(array $source): self
      *
      * @param string|null $pointer
      * @param string|null $parameter
+     * @param string|null $header
      */
-    public function __construct(?string $pointer = null, ?string $parameter = null)
+    public function __construct(?string $pointer = null, ?string $parameter = null, ?string $header = null)
     {
         $this->pointer = $pointer;
         $this->parameter = $parameter;
+        $this->header = $header;
     }
 
     /**
@@ -149,12 +157,47 @@ public function withoutParameter(): self
         return $this;
     }
 
+    /**
+     * A string indicating which request header caused the error.
+     *
+     * @return string|null
+     */
+    public function header(): ?string
+    {
+        return $this->header;
+    }
+
+    /**
+     * Add a string indicating which request header caused the error.
+     *
+     * @param string|null $header
+     * @return $this
+     */
+    public function setHeader(?string $header): self
+    {
+        $this->header = $header;
+
+        return $this;
+    }
+
+    /**
+     * Remove the source header.
+     *
+     * @return $this
+     */
+    public function withoutHeader(): self
+    {
+        $this->header = null;
+
+        return $this;
+    }
+
     /**
      * @return bool
      */
     public function isEmpty(): bool
     {
-        return empty($this->pointer) && empty($this->parameter);
+        return empty($this->pointer) && empty($this->parameter) && empty($this->header);
     }
 
     /**
@@ -173,6 +216,7 @@ public function toArray()
         return array_filter([
             'parameter' => $this->parameter,
             'pointer' => $this->pointer,
+            'header' => $this->header,
         ]);
     }
 
diff --git a/src/Core/Responses/Concerns/HasRelationship.php b/src/Core/Responses/Concerns/HasRelationship.php
index cf7f3eb..333ed10 100644
--- a/src/Core/Responses/Concerns/HasRelationship.php
+++ b/src/Core/Responses/Concerns/HasRelationship.php
@@ -48,7 +48,7 @@ private function allMeta(): ?Hash
      *
      * @return array|null
      */
-    private function metaForRelationship(): ?array
+    protected function metaForRelationship(): ?array
     {
         if ($this->hasRelationMeta && $relation = $this->relation()) {
             return $relation->meta();
diff --git a/src/Core/Responses/Internal/PaginatedIdentifierResponse.php b/src/Core/Responses/Internal/PaginatedIdentifierResponse.php
index 619bf1c..df6f47f 100644
--- a/src/Core/Responses/Internal/PaginatedIdentifierResponse.php
+++ b/src/Core/Responses/Internal/PaginatedIdentifierResponse.php
@@ -43,6 +43,8 @@ public function __construct(JsonApiResource $resource, string $fieldName, Page $
     public function meta(): Hash
     {
         return Hash::cast($this->page->meta())->merge(
+            Hash::cast(parent::metaForRelationship())
+        )->merge(
             parent::meta()
         );
     }
diff --git a/src/Core/Responses/Internal/PaginatedRelatedResourceResponse.php b/src/Core/Responses/Internal/PaginatedRelatedResourceResponse.php
index 3391687..d7a9ea8 100644
--- a/src/Core/Responses/Internal/PaginatedRelatedResourceResponse.php
+++ b/src/Core/Responses/Internal/PaginatedRelatedResourceResponse.php
@@ -43,6 +43,8 @@ public function __construct(JsonApiResource $resource, string $fieldName, Page $
     public function meta(): Hash
     {
         return Hash::cast($this->page->meta())->merge(
+            Hash::cast(parent::metaForRelationship())
+        )->merge(
             parent::meta()
         );
     }