Jira Core must be updated to be compatible with this version of Jira Software- v8.13.8

[Abhilasha Joshi]

Tried to update jira to v8.13.8 but showing error - 

Jira Core must be updated to be compatible with this version of Jira Software.

how to update jira core? updated to the v8.13.8

[Nic Brough -Adaptavist-]

Jira Core requires an installation type upgrade, it is not an application that lives on a Jira platform like Software and Service Management are.

Start at https://confluence.atlassian.com/adminjiraserver/upgrading-jira-applications-938846936.html