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When using the rackup gem, you can set the port with the --port flag

rackup --port 4000

[2023-02-18 14:28:17] INFO  WEBrick 1.8.1
[2023-02-18 14:28:17] INFO  ruby 3.1.2 (2022-04-12) [x86_64-linux]
[2023-02-18 14:28:17] INFO  WEBrick::HTTPServer#start: pid=62732 port=4000

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Use a custom rackup port