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Upgrading to 4.2 should be sufficient for the next Open edX release, since end of life has not been announced for it.
If we decide to pursue 4.4 in the future, tickets we created and cancelled for it can be found on this page: MongoDB 4.2 Upgrade Progress Tracking
Dependencies
Mongo upgrade can be done independently from other upgrade projects, e.g. Elasticsearch 7.10 , Django 3.2 Upgrade , etc. We have not identified any other dependencies.
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