diff --git a/tox.ini b/tox.ini
index 1582be921..c51407e81 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,9 @@ skipsdist = True
 stxdir = {toxinidir}/..
 
 [testenv]
-install_command = pip install -U {opts} {packages}
+install_command = pip install -U \
+  -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt} \
+  {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          OS_STDOUT_CAPTURE=1
          OS_STDERR_CAPTURE=1
@@ -78,7 +80,7 @@ commands =
     flake8
 
 [testenv:pylint]
-basepython = python2.7
+basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
        -e{[tox]stxdir}/config/tsconfig/tsconfig
        -e{[tox]stxdir}/fault/fm-api