-r ./base.txt
sphinx==1.5.4
alabaster==0.7.10
releases==1.3.0 # Updated from 1.2.0

-r ./base.txt
sphinx==1.5.5
alabaster==0.7.10
releases==1.3.0 # Updated from 1.2.0

Update sphinx from 1.5.4 to 1.5.5
Update sphinx from 1.5.4 to 1.5.5