Updating to this release's JAR is not required for current setups if you already are on the previous release, and have fetch_featured_ips in your startup arguments set to default (true). (Please read the notice below though if you are hosting a DNS) If you wish to set your own hardcoded IP for Cubecraft with fetch_featured_ips set to false, update to this JAR.
Notice to those hosting a DNS server for their setup: Since the last release, 1.30, Cubecraft on the BedrockConnect serverlist is now using the same domain to connect to as the domain in the Minecraft menu's featured serverlist. Because of this, you might notice when connecting to Cubecraft from the BedrockConnect serverlist that it directs back to BedrockConnect. (Unless you have fetch_featured_ips set to false) To fix this, you will need to remove the Cubecraft DNS record from your DNS server.