Async API Version 2.4 not supported?

Hi,

we are beginning to set up Kafka communication and created a AsyncAPI with version 2.4 as json file. On import ReadyAPI shows an error and the log says that the version is not supported. Version 2.4 isn't that old, current version seems to be 2.5. I couldn't find any details on which versions are supported and if there is anything else to be considered when creating the API definition. 

Does anyone have experience with importing AsyncAPI definitions?

Am i missing some dependecies to properly import the file?

Just for fun i increased the version in the json file to 2.5 or 3 and the same error occurs.

version in definition file:

"asyncapi": "2.4.0",

Error Log:

Fri Jan 27 11:27:51 CET 2023: ERROR: Version 2.4.0 is not supported. Please use latest version of the specification.
Fri Jan 27 11:27:51 CET 2023: ERROR: com.smartbear.readyapi.js.JavaScriptException: Version 2.4.0 is not supported. Please use latest version of the specification.
com.smartbear.readyapi.js.JavaScriptException: Version 2.4.0 is not supported. Please use latest version of the specification.