Native application
Updating a Native Application needs to be done on both provider account (where the application package is created) and the consumer side (where the application is installed).
Application provider account
- Use 
git pullto incorporate changes from main source code repository into your local copy - Use 
snow app deployto propagate changes to the application package - Create an application version and publish it
 
Application consumer account
Run ALTER APPLICATION <appName> UPGRADE (doc)