v1.9.1 is a maintenance release with the following fixes and enhancements:

- KIP-140 Admin API ACL support:

When requesting multiple create_acls or delete_acls operations

if the provided ACL bindings or ACL binding filters are not

unique it throws an exception immediately instead of failing later

when the responses are read. (#1370).

- KIP-140 Admin API ACL support:

Better documentation of the describe and delete ACLs behavior

when using the MATCH resource patter type in a filter. (#1373).

- Avro serialization examples:

added a parameter for using a generic or specific Avro schema. (#1381).

confluent-kafka-python is based on librdkafka v1.9.1, see the

[librdkafka release notes](https://github.com/edenhill/librdkafka/releases/tag/v1.9.1)

for a complete list of changes, enhancements, fixes and upgrade considerations.