Breaking Changes

Backwards compatibility with driver version 2.7.0–2.13.x

Driver version 2.14.0 only supports MongoDB 3.6 and later. It cannot connect to clusters running earlier versions of MongoDB. If you need to connect to an older cluster, please use driver version 2.13.x or earlier.

Starting in 2.11.0, BsonSerializer.Serialize will throw an InvalidOperationException when attempting to serialize an array at the root of a BSON document. Prior versions would allow this invalid operation. See and for more details.