cov-core==1.7
coverage==3.7
execnet==1.1
py==1.4.17
pytest==2.4.2
pytest-cov==1.6
pytest-xdist==1.9
tox==2.7.0
virtualenv==15.1.0

cov-core==1.15.0
coverage==4.4.1
execnet==1.4.1
py==1.4.34
pytest==3.1.3
pytest-cov==2.5.1
pytest-xdist==1.18.0
tox==2.7.0
virtualenv==15.1.0

Use current version for all libraries.
Use current version for all libraries.
