You can update a package while in either the In Project or All packages mode:
Open the Package Manager window.
If the package scope is currently set to Built-in packagesBuilt-in packages allow users to toggle Unity features on or off through the Package Manager. Enabling or disabling a package reduces the run-time build size. For example, most Projects don’t use the legacy Particle System. By removing the abstracted package of this feature, the related code and resources are not part of the final built product. Typically, these packages contain only the package manifest and are bundled with Unity (rather than available on the package registry).
See in Glossary, select either In Project or All packages from the package scope drop-down menu.
An arrow indicator appears next to any packages that have updates available.
Select the installed package you want to update from the list of packages. The package information appears in the details view.
In the list of packages, click the expander icon to the left of the package name.
If there are updates available, the latest version and verified version appear along with the See all versions link.
Click See all versions to see the list of all available versions for that package.
You can select any of these versions for the current package and see the details specific to that version in the details view.
Click the Update to button.
When the progress bar finishes, the new package version information appears in the details view, and any new functionality is immediately available.
NOTE: If you switch to an older version of a package, you might have to run the API Updater on the package contents.