AttributeError: 'Resource' object has no attribute 'reports'

[tector]

# Authenticate and construct service.
scope = ['https://www.googleapis.com/auth/analytics.readonly']
service = self._get_service('analytics', 'v3', scope, self.config['key_file'])

gav4.apply_gav4(service)
qprms = {...}  # i removed query details because they're not relevant
res = service.gav4_get(**qprms).execute()

getting this error:

File "[...]/.virtualenvs/[...]/local/lib/python2.7/site-packages/gav4/gav4.py", line 184, in gav4_get
    batch_get = self.reports().batchGet(body=convert_request(**kwargs))
AttributeError: 'Resource' object has no attribute 'reports'

I've done a fresh:

pip install --upgrade google-api-python-client
pip install --upgrade gav4

I cloned the gav4-python repository and run the tests but because analytics service object is mocked this issue doesn't appear. Has analytics service object changed its attributes in the last months and gav4 is not up to date?