"Received unknown parameter: api_version"

Upon installing Stripe 5.4, the error above is triggered on any System.check call. Stripe returns a 400 error of type "parameter unknown".

Since it fails during an API call, there's an unformatted backtrace available, but it's difficult to sanitize. I'm including the limited backtrace here:

Jul 16 07:03:58  [info] $backTrace = #0 /var/www/example.megaphonetech.com/htdocs/sites/all/modules/civicrm/CRM/Core/Error.php(463): CRM_Core_Error::backtrace("backTrace", TRUE)
#1 /var/www/example.megaphonetech.com/htdocs/sites/all/modules/civicrm/CRM/Core/Invoke.php(55): CRM_Core_Error::handleUnhandledException(Object(Stripe\Error\InvalidRequest))
#2 /var/www/example.megaphonetech.com/htdocs/sites/all/modules/civicrm/drupal/civicrm.module(444): CRM_Core_Invoke::invoke((Array:1))
#3 /var/www/example.megaphonetech.com/htdocs/includes/menu.inc(527): civicrm_invoke()
#4 /var/www/example.megaphonetech.com/htdocs/index.php(21): menu_execute_active_handler()
#5 {main}

Here's a relevant portion of the unformatted backtrace:

      array(6) {
        ["file"]=>
        string(131) "/var/www/example.megaphonetech.com/htdocs/sites/all/civicrm-custom/extensions/com.drastikbydesign.stripe/CRM/Stripe/Webhook.php"
        ["line"]=>
        int(51)
        ["function"]=>
        string(21) "checkAndUpdateWebhook"
        ["class"]=>
        string(18) "CRM_Stripe_Webhook"
        ["type"]=>
        string(2) "::"
        ["args"]=>
        array(1) {
          [0]=>
          object(Stripe\WebhookEndpoint)#411 (9) {
            ["id"]=>
            string(27) "<redacted>"
            ["object"]=>
            string(16) "webhook_endpoint"
            ["api_version"]=>
            string(10) "2019-03-14"
            ["application"]=>
            NULL
            ["created"]=>
            int(1558111760)
            ["enabled_events"]=>
            array(1) {
              [0]=>
              string(1) "*"
            }
            ["livemode"]=>
            bool(false)
            ["status"]=>
            string(7) "enabled"
            ["url"]=>
            string(59) "https://example.megaphonetech.com/civicrm/payment/ipn/2"
          }
        }
      }