Both are acceptable.
The difference in the way my ear hears it is that 'in' is more connected to the phrase 'technology planning for home security', and 'to' is more connected to the 'new approaches' part. That doesn't mean, though, that the meaning is heard differently depending on which preposition you use. They both have the same meaning and sound completely natural.
(not a teacher, just a language lover)
Student or Learner