diff --git a/doc/source/conf.py b/doc/source/conf.py
index 1074cd5..915e879 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -74,7 +74,7 @@ copyright = u'2016, DreamHost'
 #
 # The short X.Y version.
 version = subprocess.Popen(['sh', '-c', 'cd ../..; python setup.py --version'],
-                           stdout=subprocess.PIPE).stdout.read()
+                           stdout=subprocess.PIPE).stdout.read().decode('utf-8')
 version = version.strip()
 # The full version, including alpha/beta/rc tags.
 release = version
diff --git a/tox.ini b/tox.ini
index 1a5b0a7..006d0ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,6 @@ minversion = 2.0
 envlist = py35,py27,pep8,docs
 
 [testenv]
-basepython = python3
 install_command = pip install {opts} {packages}
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
@@ -16,6 +15,7 @@ commands = python setup.py testr --testr-args='{posargs}'
 basepython = python2.7
 
 [testenv:venv]
+basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/test-requirements.txt
@@ -24,6 +24,7 @@ deps =
 commands = {posargs}
 
 [testenv:pep8]
+basepython = python3
 deps =
   -r{toxinidir}/test-requirements.txt
   flake8
@@ -34,6 +35,7 @@ commands =
   bandit -r stevedore -x tests -n5
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
@@ -43,12 +45,14 @@ show-source = True
 exclude=.venv,.git,.tox,dist,*lib/python*,*egg,build
 
 [testenv:releasenotes]
+basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
+basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt