Upgraded to 4.2.1... problem importing localhost DB

Hey, upgraded WP and now am having trouble importing DB to phpmyadmin from mamp.

Getting the following error: #1273 - Unknown collation: ‘utf8mb4_unicode_ci’

The solution posted 4 down here seems to work, just not knowing if this is safe or not?

Also Post 17 here: https://wordpress.org/support/topic/unknown-collation-utf8mb4_unicode_ci?replies=13#post-6884250