diff --git a/src/Services/Auth/Jwt/JwtTokenGuard.php b/src/Services/Auth/Jwt/JwtTokenGuard.php
index d3b7af0..0c9eda9 100644
--- a/src/Services/Auth/Jwt/JwtTokenGuard.php
+++ b/src/Services/Auth/Jwt/JwtTokenGuard.php
@@ -115,7 +115,7 @@ protected function initJwtConfiguration()
     {
         $this->jwtConfiguration = Configuration::forSymmetricSigner(
             new Sha256(),
-            InMemory::plainText('')
+            InMemory::plainText($this->publicKey->getKeyContents())
         );
 
         $this->jwtConfiguration->setValidationConstraints(