diff --git a/Access/Gate.php b/Access/Gate.php
index 2f0c6c6c..74616484 100644
--- a/Access/Gate.php
+++ b/Access/Gate.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Auth\Access;
 
+use BackedEnum;
 use Closure;
 use Exception;
 use Illuminate\Auth\Access\Events\GateEvaluated;
@@ -191,7 +192,7 @@ protected function authorizeOnDemand($condition, $message, $code, $allowWhenResp
     /**
      * Define a new ability.
      *
-     * @param  string  $ability
+     * @param  \BackedEnum|string  $ability
      * @param  callable|array|string  $callback
      * @return $this
      *
@@ -199,6 +200,8 @@ protected function authorizeOnDemand($condition, $message, $code, $allowWhenResp
      */
     public function define($ability, $callback)
     {
+        $ability = $ability instanceof BackedEnum ? $ability->value : $ability;
+
         if (is_array($callback) && isset($callback[0]) && is_string($callback[0])) {
             $callback = $callback[0].'@'.$callback[1];
         }
@@ -320,7 +323,7 @@ public function after(callable $callback)
     /**
      * Determine if all of the given abilities should be granted for the current user.
      *
-     * @param  iterable|string  $ability
+     * @param  iterable|\BackedEnum|string  $ability
      * @param  array|mixed  $arguments
      * @return bool
      */
@@ -332,7 +335,7 @@ public function allows($ability, $arguments = [])
     /**
      * Determine if any of the given abilities should be denied for the current user.
      *
-     * @param  iterable|string  $ability
+     * @param  iterable|\BackedEnum|string  $ability
      * @param  array|mixed  $arguments
      * @return bool
      */
@@ -344,7 +347,7 @@ public function denies($ability, $arguments = [])
     /**
      * Determine if all of the given abilities should be granted for the current user.
      *
-     * @param  iterable|string  $abilities
+     * @param  iterable|\BackedEnum|string  $abilities
      * @param  array|mixed  $arguments
      * @return bool
      */
@@ -358,7 +361,7 @@ public function check($abilities, $arguments = [])
     /**
      * Determine if any one of the given abilities should be granted for the current user.
      *
-     * @param  iterable|string  $abilities
+     * @param  iterable|\BackedEnum|string  $abilities
      * @param  array|mixed  $arguments
      * @return bool
      */
@@ -370,7 +373,7 @@ public function any($abilities, $arguments = [])
     /**
      * Determine if all of the given abilities should be denied for the current user.
      *
-     * @param  iterable|string  $abilities
+     * @param  iterable|\BackedEnum|string  $abilities
      * @param  array|mixed  $arguments
      * @return bool
      */
@@ -382,7 +385,7 @@ public function none($abilities, $arguments = [])
     /**
      * Determine if the given ability should be granted for the current user.
      *
-     * @param  string  $ability
+     * @param  \BackedEnum|string  $ability
      * @param  array|mixed  $arguments
      * @return \Illuminate\Auth\Access\Response
      *
@@ -396,12 +399,14 @@ public function authorize($ability, $arguments = [])
     /**
      * Inspect the user for the given ability.
      *
-     * @param  string  $ability
+     * @param  \BackedEnum|string  $ability
      * @param  array|mixed  $arguments
      * @return \Illuminate\Auth\Access\Response
      */
     public function inspect($ability, $arguments = [])
     {
+        $ability = $ability instanceof BackedEnum ? $ability->value : $ability;
+
         try {
             $result = $this->raw($ability, $arguments);
 
@@ -575,7 +580,7 @@ protected function callBeforeCallbacks($user, $ability, array $arguments)
      * @param  \Illuminate\Contracts\Auth\Authenticatable  $user
      * @param  string  $ability
      * @param  array  $arguments
-     * @param  bool  $result
+     * @param  bool|null  $result
      * @return bool|null
      */
     protected function callAfterCallbacks($user, $ability, array $arguments, $result)
diff --git a/Middleware/Authenticate.php b/Middleware/Authenticate.php
index ef1a3f2e..95a16268 100644
--- a/Middleware/Authenticate.php
+++ b/Middleware/Authenticate.php
@@ -52,7 +52,7 @@ public static function using($guard, ...$others)
      *
      * @param  \Illuminate\Http\Request  $request
      * @param  \Closure  $next
-     * @param  string[]  ...$guards
+     * @param  string  ...$guards
      * @return mixed
      *
      * @throws \Illuminate\Auth\AuthenticationException
diff --git a/Middleware/Authorize.php b/Middleware/Authorize.php
index 0b6ece4a..22fb4c52 100644
--- a/Middleware/Authorize.php
+++ b/Middleware/Authorize.php
@@ -2,6 +2,7 @@
 
 namespace Illuminate\Auth\Middleware;
 
+use BackedEnum;
 use Closure;
 use Illuminate\Contracts\Auth\Access\Gate;
 use Illuminate\Database\Eloquent\Model;
@@ -29,12 +30,14 @@ public function __construct(Gate $gate)
     /**
      * Specify the ability and models for the middleware.
      *
-     * @param  string  $ability
+     * @param  \BackedEnum|string  $ability
      * @param  string  ...$models
      * @return string
      */
     public static function using($ability, ...$models)
     {
+        $ability = $ability instanceof BackedEnum ? $ability->value : $ability;
+
         return static::class.':'.implode(',', [$ability, ...$models]);
     }