Connection failed to MySQL DB after upgrade to MySQL 8

Hey guys. I upgraded my MySQL Docker Container to Version 8 (8.0.12). Since then I can’t start the Seafile Server instance.

root@seafile:/# /opt/seafile/seafile-server-latest/ start
[08/14/18 20:33:35] ../common/session.c(132): using config file /opt/seafile/conf/ccnet.conf
[08/14/18 20:33:35] ../common/ccnet-db.c(124): Failed to get database connection: Failed to connect to 
MySQL: Can't initialize character set unknown (path: compiled_in).
failed to run "ccnet-server -t"

Does Seafile do not work with MySQL 8 or do I need to change my Seafile configuration (character set)?
Character set for Kollation of the databases is: utf8_general_ci


Upgraded ccnet.conf and seafile.conf with:
connection_charset = utf8

Now it works!