Goodreads Librarians Group discussion

Author Lian Tanner has a trilogy called The Hidden which includes Ice Breaker, Sunker's Deep, and Fetcher's Song, respectively. Fetcher's Song has recently been republished as Battlesong, and the series now has a new name: The Icebreaker Trilogy.

I have two questions to update the books:
1. Do I need to do anything special to combine Fetcher's Song and Battlesong since the title has changed?
2. How do I address the series title changing?

1) You do not need to do anything special to combine.

2) You can change the series title to the new one and I like to put a note in the description saying also known as and the old series title.

But do not change the series title on the books that were released with the old title, they should stay the way they currently are.