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This page is a work in progress and will be updated with changes introduced in 5.3 that can affect compatibility with older versions of MongoDB.
In previous MongoDB versions, SCRAM-SHA-1 and SCRAM-SHA-256 can both be used for intra-cluster authentication, even if SCRAM is not explicitly enabled.
Starting in MongoDB 5.3, support for multiple arbiters in a replica set is
disabled by default. To enable support for multiple arbiters, start each
node with the
The following sections provide information for removing backward-incompatible features from your deployment. If you are downgrading from MongoDB 5.3 to an earlier version, review the following sections to ensure that your deployment runs successfully after downgrading.
Starting in MongoDB 5.3, if you are using clustered collections, you must drop those collections before you can downgrade to an earlier MongoDB version.
You must drop time series collections before downgrading MongoDB 5.3 to MongoDB 5.0.5 or earlier.