diff --git a/tox.ini b/tox.ini
index 38ca4b24..c165f4c9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,5 @@
 [tox]
-minversion = 2.0
-skipsdist = True
+minversion = 3.18.0
 envlist = docs,deploy-guide
 
 [testenv]
@@ -21,7 +20,8 @@ commands =
     sphinx-build -a -E -W -d doc/build/doctrees --keep-going -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-whitelist_externals = make
+allowlist_externals =
+  make
 description =
   Build PDF documentation.
 envdir = {toxworkdir}/docs