Samsung has released a new update A530FXXU2ARD1 for Galaxy A8 and update A730FXXU2ARD1 Galaxy A8 Plus smartphones. The new update has added latest Android security patches for the month of April.
Galaxy A8 Update A530FXXU2ARD1 and A8 Plus update A730FXXU2ARD1 will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.