I just updated Sonarqube from 5.6 (LTS) to 6.2. Before that, I upgraded all my plugins in Sonarqube itself and made an backup of my installation and database. Then, I replaced image: sonarqube:lts-alpine in my docker-compose.yaml with image: sonarqube:6.2-alpine. I did an docker-compose up and it started, however, I had some errors so it just kept on restarting. Following this advice I then proceded to delete $SONAR_HOME/data/es/. I then restarted Sonarqube, which worked. I then pointed my Webbrowser to the URL of my Sonarqube Instance and added an /setup and allowed the Database Upgrade. After that, I had a working new Sonarqube instance :).