@apsori depends on what you mean by significant. There definitely are significant changes to the Deployment chapter.
This book is aimed at people who want to learn Rails, and makes heavy use of bin/rails generate scaffold. There was sufficient change to the code that that command generates to warrant a new edition as that output changed. Additionally, the installation chapter was updated substantially due to new releases and the addition of a development dockerfile option.
If you have already learned Rails, enjoy the free book anyway. If you haven’t yet started, this is the one to start with.