diff --git a/tox.ini b/tox.ini
index 733b7b1f..bb55b656 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,7 @@ skipsdist = true
 
 [testenv]
 deps =
+    .[test]
 allowlist_externals = pytest
 setenv =
      PYTHONPATH = .:{envdir}