diff --git a/.github/workflows/php-cs-fixer.yml b/.github/workflows/php-cs-fixer.yml
index eb11d4e..7375fd9 100644
--- a/.github/workflows/php-cs-fixer.yml
+++ b/.github/workflows/php-cs-fixer.yml
@@ -18,10 +18,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
-        with:
-          ref: ${{ github.head_ref }}
-          token: ${{ secrets.PHP_CS_FIXER }}
+        uses: actions/checkout@v3
       - name: Run PHP CS Fixer
         uses: docker://oskarstark/php-cs-fixer-ga
         with:
diff --git a/composer.json b/composer.json
index d7a6193..449e6c4 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.13",
-        "pestphp/pest": "^1.21.2",
+        "pestphp/pest": "^2.3",
         "spatie/ray": "^1.34.2",
         "league/flysystem": "^3.12.2",
         "orchestra/testbench": "^8.0",
diff --git a/phpunit.xml b/phpunit.xml
index 8f4b58c..7b4f1a9 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,18 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
-         bootstrap="vendor/autoload.php"
-         colors="true"
->
-    <testsuites>
-        <testsuite name="Test Suite">
-            <directory suffix="Test.php">./tests</directory>
-        </testsuite>
-    </testsuites>
-    <coverage processUncoveredFiles="true">
-        <include>
-            <directory suffix=".php">./app</directory>
-            <directory suffix=".php">./src</directory>
-        </include>
-    </coverage>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.0/phpunit.xsd" bootstrap="vendor/autoload.php" colors="true" cacheDirectory=".phpunit.cache">
+  <testsuites>
+    <testsuite name="Test Suite">
+      <directory suffix="Test.php">./tests</directory>
+    </testsuite>
+  </testsuites>
+  <coverage>
+    <include>
+      <directory suffix=".php">./app</directory>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
 </phpunit>
diff --git a/src/Http/Middleware/CacheMiddleware.php b/src/Http/Middleware/CacheMiddleware.php
index 176cf06..4d10a20 100644
--- a/src/Http/Middleware/CacheMiddleware.php
+++ b/src/Http/Middleware/CacheMiddleware.php
@@ -26,7 +26,7 @@ public function __construct(
         protected Driver  $driver,
         protected int     $ttl,
         protected ?string $cacheKey,
-        protected bool $invalidate = false,
+        protected bool    $invalidate = false,
     ) {
         //
     }
@@ -53,7 +53,7 @@ public function __invoke(PendingRequest $pendingRequest): ?SimulatedResponsePayl
             // the SimulatedResponsePayload here.
 
             if ($this->invalidate === false && $cachedResponse->hasNotExpired()) {
-                $pendingRequest->middleware()->onResponse(fn (Response $response) => $response->setCached(true));
+                $pendingRequest->middleware()->onResponse(fn (Response $response) => $response->setCached(true), true);
 
                 return $cachedResponse->getSimulatedResponsePayload();
             }
diff --git a/src/Traits/HasCaching.php b/src/Traits/HasCaching.php
index 068186d..650c6a6 100644
--- a/src/Traits/HasCaching.php
+++ b/src/Traits/HasCaching.php
@@ -58,12 +58,17 @@ public function bootHasCaching(PendingRequest $pendingRequest): void
             ? $request->cacheExpiryInSeconds()
             : $connector->cacheExpiryInSeconds();
 
-        // Register a request middleware which wil handle the caching and recording
-        // of real responses for caching.
+        // Register a request middleware which wil handle the caching
+        // and recording of real responses for caching.
 
-        $pendingRequest->middleware()->onRequest(
-            callable: new CacheMiddleware($cacheDriver, $cacheExpiryInSeconds, $this->cacheKey($pendingRequest), $this->invalidateCache),
-        );
+        $pendingRequest->middleware()->onRequest(function (PendingRequest $middlewarePendingRequest) use ($cacheDriver, $cacheExpiryInSeconds) {
+            // We'll call the cache middleware invokable class with the $middlewarePendingRequest
+            // because this $pendingRequest has everything loaded, unlike the instance that
+            // the plugin is provided. This allows us to have access to body and merged
+            // properties.
+
+            return call_user_func(new CacheMiddleware($cacheDriver, $cacheExpiryInSeconds, $this->cacheKey($middlewarePendingRequest), $this->invalidateCache), $middlewarePendingRequest);
+        });
     }
 
     /**
diff --git a/tests/Feature/CacheTest.php b/tests/Feature/CacheTest.php
index e0844e3..0c7002e 100644
--- a/tests/Feature/CacheTest.php
+++ b/tests/Feature/CacheTest.php
@@ -11,6 +11,7 @@
 use Saloon\CachePlugin\Tests\Fixtures\Connectors\CachedConnector;
 use Saloon\CachePlugin\Tests\Fixtures\Requests\CachedPostRequest;
 use Saloon\CachePlugin\Tests\Fixtures\Requests\CachedUserRequest;
+use Saloon\CachePlugin\Tests\Fixtures\Requests\BodyCacheKeyRequest;
 use Saloon\CachePlugin\Tests\Fixtures\Requests\CachedConnectorRequest;
 use Saloon\CachePlugin\Tests\Fixtures\Requests\AllowedCachedPostRequest;
 use Saloon\CachePlugin\Tests\Fixtures\Requests\CustomKeyCachedUserRequest;
@@ -186,6 +187,37 @@
     expect($responseC->isCached())->toBeFalse();
 });
 
+test('body can be used in the cache key', function () {
+    $mockClient = new MockClient([
+        MockResponse::make(['name' => 'Sam']),
+        MockResponse::make(['name' => 'Gareth']),
+    ]);
+
+    $requestA = new BodyCacheKeyRequest;
+    $requestA->body()->set([
+        'name' => 'Sam',
+        'expiry' => '10 hours',
+    ]);
+
+    $responseA = TestConnector::make()->send($requestA, $mockClient);
+
+    expect($responseA->isCached())->toBeFalse();
+    expect($responseA->json())->toEqual(['name' => 'Sam']);
+    expect($responseA->status())->toEqual(200);
+
+    $requestB = new BodyCacheKeyRequest;
+    $requestB->body()->set([
+        'name' => 'Sam',
+        'expiry' => '10 hours',
+    ]);
+
+    $responseB = TestConnector::make()->send($requestB, $mockClient);
+
+    expect($responseB->isCached())->toBeTrue();
+    expect($responseB->json())->toEqual(['name' => 'Sam']);
+    expect($responseB->status())->toEqual(200);
+});
+
 test('you will not receive a cached response if the response has expired', function () {
     $mockClient = new MockClient([
         MockResponse::make(['name' => 'Sam']),
diff --git a/tests/Fixtures/Requests/BodyCacheKeyRequest.php b/tests/Fixtures/Requests/BodyCacheKeyRequest.php
new file mode 100644
index 0000000..a7a38f8
--- /dev/null
+++ b/tests/Fixtures/Requests/BodyCacheKeyRequest.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Saloon\CachePlugin\Tests\Fixtures\Requests;
+
+use Saloon\Enums\Method;
+use Saloon\Http\Request;
+use League\Flysystem\Filesystem;
+use Saloon\Contracts\Body\HasBody;
+use Saloon\Traits\Body\HasJsonBody;
+use Saloon\Contracts\PendingRequest;
+use Saloon\CachePlugin\Contracts\Driver;
+use Saloon\CachePlugin\Traits\HasCaching;
+use Saloon\CachePlugin\Contracts\Cacheable;
+use Saloon\CachePlugin\Drivers\FlysystemDriver;
+use League\Flysystem\Local\LocalFilesystemAdapter;
+use Saloon\CachePlugin\Tests\Fixtures\Connectors\TestConnector;
+
+class BodyCacheKeyRequest extends Request implements Cacheable, HasBody
+{
+    use HasCaching;
+    use HasJsonBody;
+
+    protected ?string $connector = TestConnector::class;
+
+    protected Method $method = Method::GET;
+
+    public function resolveEndpoint(): string
+    {
+        return '/user';
+    }
+
+    public function resolveCacheDriver(): Driver
+    {
+        return new FlysystemDriver(new Filesystem(new LocalFilesystemAdapter(cachePath())));
+    }
+
+    public function cacheExpiryInSeconds(): int
+    {
+        return 60;
+    }
+
+    protected function cacheKey(PendingRequest $pendingRequest): ?string
+    {
+        return (string)$pendingRequest->body()->all();
+    }
+}