We tried to do the update on last release, but we stumbled on an error:

 
Your requirements could not be resolved to an installable set of packages. Problem 1 - Installation request for greenpeace/planet4-child-theme dev-develop -> satisfiable by greenpeace/planet4-child-theme[dev-develop]. - greenpeace/planet4-master-theme dev-release/v1.19.0 requires wpackagist-plugin/timber-library 1.8.1 -> satisfiable by wpackagist-plugin/timber-library[1.8.1]. - greenpeace/planet4-master-theme dev-release/v1.19.0 requires wpackagist-plugin/timber-library 1.8.1 -> satisfiable by wpackagist-plugin/timber-library[1.8.1]. - Conclusion: don't install wpackagist-plugin/timber-library 1.8.1 - Installation request for greenpeace/planet4-master-theme dev-release/v1.19.0 -> satisfiable by greenpeace/planet4-master-theme[dev-release/v1.19.0].

https://circleci.com/gh/greenpeace/planet4-international/205