diff --git a/tox.ini b/tox.ini
index 1a3ce69..edfcf61 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-minversion = 2.0
+minversion = 3.18.0
 envlist = py3,pep8
 skipsdist = True
 
@@ -11,7 +11,7 @@ setenv = VIRTUAL_ENV={envdir}
 # Note the hash seed is set to 0 until horizon can be tested with a
 # random hash seed successfully.
          PYTHONHASHSEED=0
-whitelist_externals = /bin/bash
+allowlist_externals = /bin/bash
                       rm
                       find
 install_command = pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
@@ -47,7 +47,7 @@ commands = sphinx-build -W -b html doc/source doc/build/html
 [testenv:pdf-docs]
 envdir = {toxworkdir}/docs
 deps = {[testenv:docs]deps}
-whitelist_externals =
+allowlist_externals =
   rm
   make
 commands =