sphinx>=2.0.0,!=2.1.0 # BSD
sphinxcontrib-httpdomain>=1.3.0 # BSD
sphinxcontrib-blockdiag>=1.5.4 # BSD
reno>=3.1.0 # Apache-2.0
os-api-ref>=1.4.0 # Apache-2.0
openstackdocstheme>=2.2.1 # Apache-2.0