-r ./base.txt
sphinx==1.5.6
alabaster==0.7.10
releases==1.3.0  # updated from 1.2.1

-r ./base.txt
sphinx==1.5.6
alabaster==0.7.10
releases==1.3.1  # updated from 1.2.1

Update releases from 1.3.0 to 1.3.1
Update releases from 1.3.0 to 1.3.1