diff --git a/.php-cs-fixer.php b/.php-cs-fixer.php
index 5d8afeaf..b3c8d618 100644
--- a/.php-cs-fixer.php
+++ b/.php-cs-fixer.php
@@ -2,7 +2,7 @@
 
 require __DIR__.'/vendor/autoload.php';
 
-return (new \MattAllan\LaravelCodeStyle\Config())
+return (new \Jubeki\LaravelCodeStyle\Config())
     ->setFinder(
         \PhpCsFixer\Finder::create()
             ->exclude(['bootstrap', 'docker', 'public', 'resources', 'storage'])
diff --git a/composer.json b/composer.json
index 2e7a5886..eb8f94d4 100644
--- a/composer.json
+++ b/composer.json
@@ -21,12 +21,12 @@
         }
     ],
     "require": {
-        "firebase/php-jwt": "^5.2",
+        "firebase/php-jwt": "^5.5|^6.0",
         "guzzlehttp/guzzle": "^7.0",
         "phpseclib/phpseclib": "^2.0"
     },
     "require-dev": {
-        "matt-allan/laravel-code-style": "dev-main",
+        "jubeki/laravel-code-style": "^1.0",
         "mockery/mockery": "^1.4",
         "nesbot/carbon": "^2.43",
         "phpunit/phpunit": "^9.5"
diff --git a/src/LtiMessageLaunch.php b/src/LtiMessageLaunch.php
index 4a680dc4..38c0d6ef 100644
--- a/src/LtiMessageLaunch.php
+++ b/src/LtiMessageLaunch.php
@@ -286,13 +286,15 @@ private function getPublicKey()
         foreach ($publicKeySet['keys'] as $key) {
             if ($key['kid'] == $this->jwt['header']['kid']) {
                 try {
-                    return openssl_pkey_get_details(
-                        JWK::parseKeySet([
-                            'keys' => [$key],
-                        ])[$key['kid']]
-                    );
+                    $keySet = JWK::parseKeySet([
+                        'keys' => [$key],
+                    ]);
                 } catch (\Exception $e) {
-                    return false;
+                    // Do nothing
+                }
+
+                if (isset($keySet[$key['kid']])) {
+                    return $keySet[$key['kid']];
                 }
             }
         }
@@ -385,7 +387,7 @@ private function validateJwtSignature()
 
         // Validate JWT signature
         try {
-            JWT::decode($this->request['id_token'], $public_key['key'], ['RS256']);
+            JWT::decode($this->request['id_token'], $public_key, ['RS256']);
         } catch (ExpiredException $e) {
             // Error validating signature.
             throw new LtiException(static::ERR_INVALID_SIGNATURE);