diff --git a/requirements.txt b/requirements.txt
index cf5600d..e134b2f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0  # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4'  # BSD
+sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2  # BSD
 graphviz>=0.4,!=0.5.0  # MIT License
 stestr>=2.0.0
 testtools>=0.9.34
diff --git a/setup.cfg b/setup.cfg
index 0c5bd5d..2224591 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -10,9 +10,3 @@ classifier =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
-
-[pbr]
-warnerrors = True
-
-[wheel]
-universal = 1
diff --git a/tox.ini b/tox.ini
index 2b3aa99..ca3288f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,6 @@ ignore_basepython_conflict = True
 basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
-install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
 commands = stestr run --slowest {posargs}