Companies want their employees to be fully invested in the jobs that they are applying for. There are many software tools coming up and many processes being invented regularly in the project management landscape. Hence, project managers need to continually upgrade their skills to be relevant. Basically, tell your interviewer about what you are doing to grow in your field. It could be certification courses you are taking or workshops/courses you are attending. Also, you can talk about your interactions with project managers and people in the field to stay up-to-date with the latest.