Shopify-api-node: Upgrading from 2.25.1 to 3.x results in ParseError

I’m trying to update the package from version 2.25.1 to the latest version 3.3.2, but as soon as I do that, I get the following error on any call on the shopify instance:

{
   "name":"ParseError",
   "timings":{
      "start":1593343057528,
      "socket":1593343057529,
      "lookup":1593343057539,
      "connect":1593343057541,
      "secureConnect":1593343057544,
      "upload":1593343057544,
      "response":1593343057719,
      "end":1593343057783,
      "phases":{
         "wait":1,
         "dns":10,
         "tcp":2,
         "tls":3,
         "request":0,
         "firstByte":175,
         "download":64,
         "total":255
      }
   }
}

Any idea what might cause that?