nox > Running session unit-3.6
nox > Re-using existing virtual environment at .nox/unit-3-6.
nox > pip install mock pytest google-cloud-testutils pytest-cov freezegun -c /Users/swast/src/python-bigquery/testing/constraints-3.6.txt
nox > pip install -e .[all] -c /Users/swast/src/python-bigquery/testing/constraints-3.6.txt
nox > Command pip install -e .[all] -c /Users/swast/src/python-bigquery/testing/constraints-3.6.txt failed with exit code 1:
Obtaining file:///Users/swast/src/python-bigquery
Collecting google-api-core[grpc]<2.0.0dev,>=1.23.0
  Using cached google_api_core-1.23.0-py2.py3-none-any.whl (91 kB)
Collecting proto-plus>=1.10.0
  Using cached proto_plus-1.10.0-py3-none-any.whl
Collecting google-cloud-core<2.0dev,>=1.4.1
  Using cached google_cloud_core-1.4.1-py2.py3-none-any.whl (26 kB)
Collecting google-resumable-media<2.0dev,>=0.6.0
  Using cached google_resumable_media-0.6.0-py2.py3-none-any.whl (41 kB)
Requirement already satisfied: packaging>=14.3 in ./.nox/unit-3-6/lib/python3.6/site-packages (from google-cloud-bigquery==2.12.0) (20.9)
Collecting protobuf>=3.12.0
  Using cached protobuf-3.12.0-cp36-cp36m-macosx_10_9_x86_64.whl (1.3 MB)
Collecting google-cloud-bigquery-storage<3.0.0dev,>=2.0.0
  Using cached google_cloud_bigquery_storage-2.0.0-py2.py3-none-any.whl (60 kB)
Collecting grpcio<2.0dev,>=1.32.0
  Using cached grpcio-1.32.0-cp36-cp36m-macosx_10_9_x86_64.whl (3.3 MB)
Collecting pyarrow<4.0dev,>=1.0.0
  Using cached pyarrow-1.0.0-cp36-cp36m-macosx_10_9_intel.whl (11.1 MB)
Collecting pandas>=0.23.0
  Using cached pandas-0.23.0-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (16.8 MB)
ERROR: Could not find a version that satisfies the requirement pyarrow<4.0dev,>=3.0.0 (from google-cloud-bigquery[all])
ERROR: No matching distribution found for pyarrow<4.0dev,>=3.0.0
nox > Session unit-3.6 failed.