The Oozie root pom uses the ASF root pom as it's parent (as required by ASF rules). We're currently using version 17, which is from 2015. The current version is 19, from earlier this year (2018). We should update this.
You can see more details about the ASF root pom, including diffs between each version here:
This may require some testing or at least looking into because the ASF root pom defines the versions of some things, especially maven plugins, and so things may break or be incompatible.