diff --git a/app/Auth/PassportUserRepository.php b/app/Auth/PassportUserRepository.php
index 1c3fded..f4ea949 100644
--- a/app/Auth/PassportUserRepository.php
+++ b/app/Auth/PassportUserRepository.php
@@ -3,13 +3,22 @@
 namespace App\Auth;
 
 use Laravel\Passport\Bridge\UserRepository;
-use League\OAuth2\Server\Entities\ClientEntityInterface;
+use Laravel\Passport\Bridge\UserRepositoryInterface;
 use Laravel\Passport\Bridge\User;
-use Illuminate\Support\Facades\Hash;
+use League\OAuth2\Server\Entities\ClientEntityInterface;
 use App\Models\User as UserModel;
 
 class PassportUserRepository extends UserRepository
 {
+    /**
+     * OAuth2.
+     *
+     * @param string $username
+     * @param string $password
+     * @param string $grantType
+     * @param ClientEntityInterface $clientEntity
+     * @return User|null
+     */
     public function getUserEntityByUserCredentials(
         $username,
         $password,
@@ -18,37 +27,14 @@ class PassportUserRepository extends UserRepository
     ) {
         $user = UserModel::where('email', $username)->first();
 
-        if (!$user) {
+        if (! $user) {
             return null;
         }
 
-        // Avoid Hash::check() error with non-bcrypt hashes
-        if ($this->isBcryptHash($user->password)) {
-            if (Hash::check($password, $user->password)) {
-                return new User($user->id);
-            }
-        } else {
-            // If the hash is not bcrypt, check for MD5 manually
-            if (md5($password) === $user->password) {
-                // Upgrade password to bcrypt
-                $user->password = Hash::make($password);
-                $user->save();
-
-                return new User($user->id);
-            }
+        if (md5($password) === $user->password) {
+            return new User($user->getAuthIdentifier());
         }
 
         return null;
     }
-
-    /**
-     * Check if the given hash uses the bcrypt algorithm.
-     *
-     * @param string $hashedPassword
-     * @return bool
-     */
-    protected function isBcryptHash($hashedPassword): bool
-    {
-        return password_get_info($hashedPassword)['algo'] === PASSWORD_BCRYPT;
-    }
 }