On 20-06-2019 starting with 12:00 EEST ( 05:00 EDT/EST - 02:00 PDT/PST ) for 2 hours, we'll be updating Wordpress to the latest version 5.2.2 on all production instances. During this time, the wp-admin can become inaccessible for brief periods of time while the new version is applied. The public sites will not be affected and they will work normally. The development/staging sites are already upgraded to version 5.2.2 and no issues have been detected.
For any inquiries during this time don't hesitate to contact us at email@example.com
This is a minor WordPress maintenance release and more details about the new version can be found at https://wordpress.org/news/2019/06/wordpress-5-2-2-maintenance-release/