diff --git a/tox.ini b/tox.ini
index 0411791..2363f31 100644
--- a/tox.ini
+++ b/tox.ini
@@ -17,6 +17,7 @@ deps =
 commands_pre =
     #
 commands =
+    poetry install --with dev
     poetry run ruff check src
     poetry run mkdocs build