Debezium Ebedded cannot instatiate transformation 'unwrap'

Question

I managed to stream CDC events from Postgres using Debezium Embedded version 1.6.2.Final. Now I'm interested in flattening the events so only the after data is sent.

As per the following article: https://debezium.io/documentation/reference/1.6/transformations/event-flattening.html#_configuration

I assume these are the properties I need to include in my Configuration

        return io.debezium.config.Configuration.create()
                ...
                .with("transforms", "unwrap")
                .with("transforms.unwrap", "io.debezium.transforms.ExtractNewRecordState")
                .build();

Then I create my DebeziumEngine like below:

        this.debeziumEngine = DebeziumEngine.create(Json.class)
                .using(cdcConfiguration.asProperties())
                .notifying(...)
                .build();

When I run the application I get the following error on startup:

io.debezium.DebeziumException: Cannot instatiate transformation 'unwrap'
    at io.debezium.embedded.Transformations.getTransformation(Transformations.java:66) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.Transformations.<init>(Transformations.java:44) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.EmbeddedEngine.<init>(EmbeddedEngine.java:593) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.EmbeddedEngine.<init>(EmbeddedEngine.java:81) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.EmbeddedEngine$BuilderImpl.build(EmbeddedEngine.java:302) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.EmbeddedEngine$BuilderImpl.build(EmbeddedEngine.java:218) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]
    at io.debezium.embedded.ConvertingEngineBuilder.build(ConvertingEngineBuilder.java:151) ~[debezium-embedded-1.6.2.Final.jar:1.6.2.Final]

Could somebody please point what I'm doing wrong?