You can update the ports in your yaml configuration file:
http:
port: 9000
adminPort: 9001
See http://www.dropwizard.io/0.9.2/docs/manual/configuration.html#http for more information.
EDIT
If you’ve migrated to Dropwizard 0.7.x, 0.8.x, 0.9.x you can use the following:
server:
applicationConnectors:
- type: http
port: 9000
adminConnectors:
- type: http
port: 9001