InvalidRequest

Hi,
I have a problem with the plugin in version 2.9.
All files are generated on the static html dir but there are not sync in the S3 bucket and the cloudfront distribution is not reset…

This is my error message :

S3Response Object
(
    [error] => Array
        (
            [code] => InvalidRequest
            [message] => The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.
        )

    [code] => 400
    [headers] => Array
        (
            [x-amz-request-id] => 50BA61D456FBA306
            [x-amz-id-2] => M7o4NaGiErMbrVelnCURA3MLdj4Rek/MkIj1BWgAxU4aG8DG7FMSagVzHVw40pgEXDbgU9+0K54=
            [x-amz-region] => eu-central-1
            [Content-Type] => application/xml
            [Transfer-Encoding] => chunked
            [Connection] => close
            [Server] => AmazonS3
        )

    [body] => <?xml version="1.0" encoding="UTF-8"?>
<Error><Code>InvalidRequest</Code><Message>The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.</Message><RequestId>50BA61D456FBA306</RequestId><HostId>M7o4NaGiErMbrVelnCURA3MLdj4Rek/MkIj1BWgAxU4aG8DG7FMSagVzHVw40pgEXDbgU9+0K54=</HostId></Error>
)