23andMe has updated their Y-Chromosome haplogroup assignments. I went from R M-417 (R1a1a1) to R YP-445 (R1a1a1b1a1b1d), which is way downstream. If you have tested with 23andMe and have not undergone further Y-Chromosome sequencing, you can go back to your 23andMe reports and find your updated haplogroup.