How to increase number when converting json

I am trying to increase the version field. entrance

{"version":1}

      

        
        
        
      

    

The way out should be

{"v":2}

      

        
        
        
      

    

When i do

echo '{"version":1}'|jq '{"v":.version+1}'

      

        
        
        
      

    

I get

error: syntax error, unexpected '+', expecting '}'

      

        
        
        
      

    

When added to string interpolation works

echo '{"version":1}'|jq '{"v":"\(.version+1)"}'

      

        
        
        
      

    

gives

{
  "v":"2"
}

      

        
        
        
      

    

I need v to be of type number.