Let's add our dependencies to the project:

<dependencies>
    <dependency>
        <groupId>org.eclipse</groupId>
        <artifactId>yasson</artifactId>
        <version>1.0.3</version>
    </dependency>     
    <dependency>
        <groupId>org.glassfish</groupId>
        <artifactId>javax.json</artifactId>
        <version>1.1.4</version>
    </dependency>    
</dependencies>