diff --git a/tox.ini b/tox.ini
index 1950b4e..33da3de 100644
--- a/tox.ini
+++ b/tox.ini
@@ -34,7 +34,7 @@ skip_install = True
 deps =
 	towncrier
 	jaraco.develop >= 7.23
-passenv = *
+pass_env = *
 commands =
 	python -m jaraco.develop.finalize
 
@@ -46,7 +46,7 @@ deps =
 	build
 	twine>=3
 	jaraco.develop>=7.1
-passenv =
+pass_env =
 	TWINE_PASSWORD
 	GITHUB_TOKEN
 setenv =