diff --git a/onap-dcae-cbs-docker-client/tox.ini b/onap-dcae-cbs-docker-client/tox.ini
index 673ca37..04b292e 100644
--- a/onap-dcae-cbs-docker-client/tox.ini
+++ b/onap-dcae-cbs-docker-client/tox.ini
@@ -1,6 +1,6 @@
 # content of: tox.ini , put in same dir as setup.py
 [tox]
-envlist = py36,flake8,py38
+envlist = py36, flake8, py38, py39
 
 [testenv]
 deps=
@@ -11,13 +11,14 @@
     HOSTNAME = testhostname
     CONFIG_BINDING_SERVICE = config-binding-service
     PYTHONPATH={toxinidir}
+    TEST_ENV=test_env
 
 commands=
     pytest --junitxml xunit-results.xml --cov onap_dcae_cbs_docker_client --cov-report xml
     coverage xml
 
 [testenv:flake8]
-basepython = python3.6
+basepython = python3.8
 skip_install = true
 deps = flake8
 commands = flake8 setup.py onap_dcae_cbs_docker_client tests