diff --git a/tox.ini b/tox.ini
index 3aa6116b8..4799b92f5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -118,7 +118,7 @@ basepython = python2.7
 setenv =
 	 # If no positional arguments are given, try to run the checks on the
 	 # entire codebase, including various pieces of supporting code.
-	 DEFAULT_FILES=src integration static misc setup.py
+	 DEFAULT_FILES=src integration static misc
 commands =
          flake8 {posargs:{env:DEFAULT_FILES}}
 
@@ -135,7 +135,7 @@ passenv = HOME
 setenv =
 	 # If no positional arguments are given, try to run the checks on the
 	 # entire codebase, including various pieces of supporting code.
-	 DEFAULT_FILES=src integration static misc setup.py
+	 DEFAULT_FILES=src integration static misc
 commands =
          flake8 {posargs:{env:DEFAULT_FILES}}
          python misc/coding_tools/check-umids.py {posargs:{env:DEFAULT_FILES}}
@@ -260,7 +260,6 @@ commands=
     pyinstaller -y --clean pyinstaller.spec
 
 [testenv:tarballs]
-deps =
+deps = build
 commands =
-         python setup.py update_version
-         python setup.py sdist --formats=bztar,gztar,zip bdist_wheel
+         python -m build