diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d298bd..0af3eee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,10 @@
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).
 In order to read more about upgrading and BC breaks have a look at the [UPGRADE Document](UPGRADE.md).
 
+## 1.7.0
+
++ allow the `acl` param to be null, since certain storage system throw an error if an unsupported header value is provided.
+
 ## 1.6.0 (12. April 2023)
 
 + **Removed Testing for PHP 7.0, 7.1, 7.2 and 7.3**
diff --git a/src/S3FileSystem.php b/src/S3FileSystem.php
index 214da06..1b45d73 100644
--- a/src/S3FileSystem.php
+++ b/src/S3FileSystem.php
@@ -57,7 +57,8 @@ class S3FileSystem extends BaseFileSystemStorage
     public $region;
 
     /**
-     * @var string The ACL default permission when writing new files. All available options are `private|public-read|public-read-write|authenticated-read|aws-exec-read|bucket-owner-read|bucket-owner-full-control`
+     * @var string The ACL default permission when writing new files. All available options are `private|public-read|public-read-write|authenticated-read|aws-exec-read|bucket-owner-read|bucket-owner-full-control` if null, this header
+     * will be ignored.
      */
     public $acl = 'public-read';
 
@@ -132,7 +133,9 @@ public function extendPutObject(array $config)
             $config['CacheControl'] = 'max-age=' . $this->maxAge;
         }
 
-        return $config;
+        // remove null values from the config,
+        // this is mainly usfull if acl is set to null.
+        return array_filter($config);
     }
 
     private $_client;
@@ -245,12 +248,12 @@ public function updateBucketPolicy($policy)
      */
     public function folderCreate($folder)
     {
-        return $this->client->putObject([
+        return $this->client->putObject(array_filter([
             'ACL' => $this->acl,
             'Bucket' => $this->bucket,
             'Key' => rtrim($folder, '/') . '/',
             'Body' => "",
-        ]);
+        ]));
     }
 
     /**