Reminder: change the `pants_version` to upgrade

Change the `pants_version` option in the `[GLOBAL]` scope in your pants.toml to upgrade.

You can see all releases at <https://pypi.org/project/pantsbuild.pants/#history>.

## Upgrade one minor release at a time

Per our [Deprecation policy](🔗), deprecations must last a minimum of one minor release. For example, something may be deprecated in 2.1.0 and then removed in 2.2.0.

This means that it is helpful to upgrade one minor release at a time so that you can see all deprecation warnings.

You do not need to land every upgrade into your organization—often, you will want to upgrade your organization multiple versions at a time, e.g. 2.1.0 to 2.4.0. But, when you are working on the upgrade locally, it is helpful to iterate one version at a time.

First, see if Pants can automatically fix any safe deprecations for you:

You can add `update-build-files` to your [continuous integration](🔗) so that developers don't accidentally use removed features:

Then, see if there are any remaining deprecation warnings:

It is also helpful to spot-check that your main commands like `lint`, `package`, and `test` still work by running on a single target.

Use dev releases for the newest

As described in our [Release strategy](🔗), we make weekly dev releases with all the latest features and bug fixes we've been working on. While dev releases are less stable, they mean you get access to improvements sooner.

If you encounter any blocking issues, you can easily roll back to a prior version by changing the `pants_version` option. (Please let us know the issue by opening a [GitHub issue](🔗) or messaging us on [Slack](🔗)).

## Ignore deprecation messages with `ignore_warnings`

Sometimes when upgrading, you will not have time to fully fix the deprecation. The `ignore_warnings` option allows you to silence those deprecations.

The `ignore_warnings` option expects a string with the start of the deprecation warning. You can also prefix the string with `$regex$` to use a regex pattern instead of literal string matching.

## Check for updates to the `pants` script

Run `curl -L -o pants https://pantsbuild.github.io/setup/pants` to check if there have been any changes, e.g. adding support for running Pants with new Python interpreters.

## Find any bugs or issues?

Please either open a [GitHub issue](🔗) or head over to [Slack](🔗). We'd be happy to help and would appreciate knowing about the issue!