Drupal 8 manual install - 1115 Unknown character set: 'utf8mb4'


php version 5.6.10
mysql version 14.14 Distrib 5.5.38

When installing drupal 8, I get this:

User/pass combo works because I can log into mysql with ssh.

MYSQL.org suggests the mysql version is out of date, but others on stackexchange suggest that utf8mb4 should work for this version.

Is this a case of upgrading mysql? What’s the deal here?