diff --git a/tox.ini b/tox.ini
index e3048c1..160a42c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-minversion = 3.2
+minversion = 3.18.0
 envlist = py37,py39,pep8
 ignore_basepython_conflict = True
 
@@ -39,7 +39,7 @@ commands = sphinx-build -W -b html doc/source doc/build/html
 [testenv:pdf-docs]
 basepython = python3
 deps = {[testenv:docs]deps}
-whitelist_externals =
+allowlist_externals =
   make
 commands =
   sphinx-build -W -b latex doc/source doc/build/pdf