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[JammyDodger]

I think a manual rebuild should sort you out.

Manually update Discourse and Docker image to latest

If you self-host Discourse, you occasionally need to run a manual update via the command line to get the latest security releases newest libraries. These updates are not picked up in admin/update, which is why you’ll occasionally need to do this additional step. Discourse itself should be updated about twice a month, by clicking the “Update to Latest Version” button in your admin dashboard (admin/update). Every two months we recommend SSH’ing into your web server (using putty or your favor…