Samsung — my samsung galaxy A5 is not getting lollipop update :(

Address:

Thiruvananthapuram, Kerala

Most of the android phone got lollipop update but my A5 is still not get updated why Before buying A5 I was using Galaxy S3 the same problem it has not getting new version of android My sister using iphone 5 . She will get the latest update then why samsung is not providing latest update pls make it fast mail: [protected]@gmail.com