diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 5275886..2574f6c 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -33,6 +33,7 @@ jobs:
 
       - name: 'Install project dependencies'
         run: |
+          composer global config --no-plugins allow-plugins.symfony/flex true
           composer global require --no-progress --no-scripts --no-plugins symfony/flex
           composer update --no-interaction --prefer-dist --optimize-autoloader --prefer-stable
           vendor/bin/simple-phpunit install
diff --git a/src/Configuration/ElFinderConfigurationReader.php b/src/Configuration/ElFinderConfigurationReader.php
index 582d984..15278df 100644
--- a/src/Configuration/ElFinderConfigurationReader.php
+++ b/src/Configuration/ElFinderConfigurationReader.php
@@ -232,16 +232,19 @@ private function configureFlysystem($opt, $adapter, $serviceName)
 
                 break;
             case 'aws_s3_v3':
-                $client = new S3Client([
-                    'credentials' => [
-                        'key'     => $opt['aws_s3_v3']['key'],
-                        'secret'  => $opt['aws_s3_v3']['secret'],
-                    ],
+                $s3Options = [
                     'region'                  => $opt['aws_s3_v3']['region'],
                     'version'                 => $opt['aws_s3_v3']['version'],
                     'endpoint'                => $opt['aws_s3_v3']['endpoint'],
                     'use_path_style_endpoint' => $opt['aws_s3_v3']['use_path_style_endpoint'],
-                ]);
+                ];
+                if (!empty($opt['aws_s3_v3']['key']) && !empty($opt['aws_s3_v3']['secret'])) {
+                    $s3Options['credentials'] = [
+                        'key'    => $opt['aws_s3_v3']['key'],
+                        'secret' => $opt['aws_s3_v3']['secret'],
+                    ];
+                }
+                $client     = new S3Client($s3Options);
                 $filesystem = new Filesystem(new AwsS3v3($client, $opt['aws_s3_v3']['bucket_name'], $opt['aws_s3_v3']['optional_prefix'], null, null, $opt['aws_s3_v3']['options']));
 
                 break;