Two new flags was added to cassandra.yaml since 3.11.5 version:

enable_sasi_indexes and replica_filtering_protection

As we are using cassandra-3.11.4 dependency, the connector fails when it's used with Cassandra >=3.11.5

https://github.com/debezium/debezium-connector-cassandra/blob/main/pom.xml#L73

Exception in thread "main" org.apache.cassandra.exceptions.ConfigurationException: Invalid yaml. Please remove properties [enable_sasi_indexes, replica_filtering_protection] from your cassandra.yaml

I'm going to work on this issue, build the project with the last version of cassandra (3.11.10), confirm that works with the versions >= 3.11.5