diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index 90260a57ca32..3c237cc9e5a7 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -2586,7 +2586,7 @@ public function escapeWhenCastingToString($escape = true)
      *
      * @return array
      */
-    public function __sleep()
+    public function __serialize()
     {
         $this->mergeAttributesFromCachedCasts();
 
@@ -2595,7 +2595,7 @@ public function __sleep()
         $this->relationAutoloadCallback = null;
         $this->relationAutoloadContext = null;
 
-        return array_keys(get_object_vars($this));
+        return get_object_vars($this);
     }
 
     /**
diff --git a/src/Illuminate/Queue/Middleware/RateLimited.php b/src/Illuminate/Queue/Middleware/RateLimited.php
index a2b5343e59db..f3b99ed0ec70 100644
--- a/src/Illuminate/Queue/Middleware/RateLimited.php
+++ b/src/Illuminate/Queue/Middleware/RateLimited.php
@@ -147,11 +147,11 @@ protected function getTimeUntilNextRetry($key)
      *
      * @return array
      */
-    public function __sleep()
+    public function __serialize()
     {
         return [
-            'limiterName',
-            'shouldRelease',
+            'limiterName' => $this->limiterName,
+            'shouldRelease' => $this->shouldRelease,
         ];
     }
 
diff --git a/tests/Integration/Cache/Fixtures/Unserializable.php b/tests/Integration/Cache/Fixtures/Unserializable.php
index 4deefdaeb6f2..83730e758fc4 100644
--- a/tests/Integration/Cache/Fixtures/Unserializable.php
+++ b/tests/Integration/Cache/Fixtures/Unserializable.php
@@ -6,7 +6,7 @@
 
 class Unserializable
 {
-    public function __sleep()
+    public function __serialize()
     {
         throw new Exception('Not serializable');
     }