Powershell FTP script to copy files with encryption

Question

Below is the powershell script to copy files to to our FTP folder, now encryption has changed to 'Use Explicit FTP Over TLS', how do I modify script with encryption added to it. this script used to work before encryption added.

$FTPHost = "ftp://ftp.com"
$FTPUser = "xxxxx"
$FTPPass = "xxxxxx"
$source = "C:\Test"

$webClient = New-Object System.Net.WebClient
$webClient.Credentials = New-Object System.Net.NetworkCredential($FTPUser, $FTPPass)

$files = get-childitem $source -recurse -force

foreach ($file in $files) {
    Write-Host "Uploading $file"
    $webClient.UploadFile("$FTPHost" + "/" + $file.Name, "STOR", $file.FullName)
}

$webClient.Dispose()