diff --git a/tox.ini b/tox.ini
index f424065..de898b9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 
-minversion = 3.1.1
+minversion = 3.18.0
 envlist = py36,py38,pypy,pep8
 skipsdist = True
 ignore_basepython_conflict = True
@@ -16,7 +16,7 @@ setenv =
 passenv = OS_STDOUT_CAPTURE OS_STDERR_CAPTURE OS_TEST_TIMEOUT OS_TEST_LOCK_PATH http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY ZUUL_CACHE_DIR REQUIREMENTS_PIP_LOCATION
 usedevelop = True
 install_command = pip install -U {opts} {packages}
-whitelist_externals = *
+allowlist_externals = *
 deps = -r{toxinidir}/test-requirements.txt
 commands =
     find . -type f -name "*.pyc" -delete
@@ -38,11 +38,11 @@ deps =
 commands =
   rm -rf doc/build
   sphinx-build -W -b html doc/source doc/build/html
-whitelist_externals = rm
+allowlist_externals = rm
 
 [testenv:pdf-docs]
 deps = {[testenv:docs]deps}
-whitelist_externals =
+allowlist_externals =
     make
 commands =
     sphinx-build -W -b latex doc/source doc/build/pdf