It depends on whether it feels natural or not. In my experience, the only writer I've read who can really carry this off is Neal Stephenson. Whenever I've run across it elsewhere, it just feels contrived and annoying and throws me out of the story.
Stephenson changes tenses for different parts of The Cryptonomicon because he's changing times (although the past is written in present tense and the present is written in past tense), but it *works*.
Why it works for him but not for most people, I can't explain, but for most people it just feels contrived - as though the writer is being trendy or imitative. You might want to examine why you want to write in present tense and see if it fulfills the needs of the story. Everything should serve the story.
Just my 2 cents.
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