download the new JAR file) and the new version will just work. However, please review the How to Upgrade instructions before upgrading. And be sure to check the Release Notes for 5.3 and Release Notes for 5.3.1 too.
Component field visibility
In prior versions of Tapestry, all instance fields of components had to be visibility private; starting with version 5.3.2, this has been relaxed. Component fields may be protected, or package private (that is, no visibility modifier). Fields that are final, or annotated with @Retain may even be public. In any case, this makes it easier for pages to work with other pages in the same package, and for subclasses to more easily access the fields (including parameter fields, or injections) provided by base classes. This feature should be used with care, as it can lead to designs that are more difficult to maintain.
Spring 3.1 upgrade
The Spring integration module has updated the Spring dependencies to 3.1.0.RELEASE
TextField component support for HTML5 values
The TextField components now support HTML5 any HTML5 type attribute.