diff --git a/lower-constraints.txt b/lower-constraints.txt
index 7d44eff..f7eec08 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -31,7 +31,7 @@ pep8==1.7.1
 prettytable==0.7.2
 pyflakes==1.0.0
 Pygments==2.2.0
-pylint==1.4.5
+pylint==1.9.2
 pyparsing==2.1.0
 pyperclip==1.5.27
 python-mimeparse==1.6.0
diff --git a/test-requirements.txt b/test-requirements.txt
index d05e3e6..e40a77f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,6 +5,6 @@ flake8<2.6.0,>=2.5.4 # MIT
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
-pylint==1.4.5 # GPLv2
+pylint==1.9.2 # GPLv2
 stestr>=2.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT
diff --git a/tox.ini b/tox.ini
index fdd750e..7a72d1b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,6 +33,7 @@ python_files = test_*.py
 norecursedirs  = .tox .venv
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:py27]
@@ -45,13 +46,16 @@ basepython = python3.5
 basepython = python3.6
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -b html doc/source doc/build/html
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 freezerclient
 
 [testenv:pylint]
+basepython = python3
 commands = pylint --rcfile .pylintrc freezerclient
 
 [flake8]
@@ -69,6 +73,7 @@ exclude = .venv,.tox,dist,doc,*egg,releasenotes
 
 
 [testenv:releasenotes]
+basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
     -r{toxinidir}/requirements.txt