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Updating WordPress, plugins, and themes 
There is an important caveat to keep in mind when maintaining WordPress on Upsun Fixed, namely that after the build process has completed your site is left with a read-only file system. This makes updating WordPress core, themes, and plugins not possible at runtime through the administration panel like you may be used to.
Keeping WordPress up-to-date in environments like this is the primary reason that managing WordPress with Composer is recommended. Keeping a vanilla WordPress up-to-date on Upsun Fixed requires you to clone the repository locally and subsequently remove and re-download WordPress core, themes, and plugins to their updated version. Perform this on a new branch, and push to Upsun Fixed to test the updates before merging.
If you choose to keep themes, plugins, and core defined as submodules in your project,
consult the submodule documentation and git pull for the latest version.
Local development with Lando
Lando is a local development tool. Lando can read your Upsun Fixed configuration files for WordPress and produce an approximately equivalent configuration using Docker See a guide on using Lando with Upsun Fixed.
Templates come configured for use already with a base Landofile,
as in the following example.
It can be helpful getting started with Lando without the need to have a project on Upsun Fixed.
This file sets up good defaults for Lando and Upsun Fixed-configured codebases,
most notably through the recipe attribute.
This Landofile is also where you can configure access to tools that would normally be available within a Upsun Fixed app container (such as the WordPress CLI) and that you also want to access locally.
You can replicate this file or follow the guide on using Lando with Upsun Fixed. Once you have completed the configuration, you can start your local environment by running:
lando start