Getting error while running SoapUI tests from Maven.

While running SoapUI tests from Maven getting below error that "com/eviware/soapui/maven2/TestMojo has been compiled by a more recent version of the Java Runtime (class file version 53.0) this version of the Java Runtime only recognizes class file versions up to 52.0". What Java version I have to use here?

I am using below in pom.xml

<groupId>com.smartbear.soapui</groupId>
<artifactId>soapui-maven-plugin</artifactId>
<version>5.6.0</version>