diff --git a/tox.ini b/tox.ini
index ff5a2d680..7d869b6bd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -171,6 +171,7 @@ commands =
 install_command = python -m pip install --no-use-pep517 {opts} {packages}
 extras =
 deps =
+    {[testenv]deps}
     packaging
     pyinstaller
 # Setting PYTHONHASHSEED to a known value assists with reproducible builds.