diff --git a/requirements.txt b/requirements.txt
index d8ff140..5b1df32 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,4 +25,4 @@ oslo.utils>=3.36.0 # Apache-2.0
 testtools>=2.2.0 # MIT
 oslotest>=3.2.0 # Apache-2.0
 tempest>=17.1.0 # Apache-2.0
-networkx>=2.3;python_version>='3.4'  # BSD
+networkx>=2.3  # BSD
diff --git a/tox.ini b/tox.ini
index 21429cb..7cafdb5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,15 +18,12 @@ deps = -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8 {posargs}
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [testenv:cover]
-basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
     PYTHON=coverage run --source virtage_tempest_plugin --parallel-mode
@@ -37,16 +34,13 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-basepython = python3
 commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
-basepython = python3
 commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]
-basepython = python3
 commands = oslo_debug_helper {posargs}
 
 [flake8]