diff --git a/tox.ini b/tox.ini
--- a/tox.ini
+++ b/tox.ini
@@ -19,6 +19,12 @@
 deps =
     mypy
     sqlalchemy-stubs
+    types-Flask
+    types-Jinja2
+    types-PyYAML
+    types-Werkzeug
+    types-click
+    types-pkg_resources
 commands =
     # No where close to passing yet, but nice to have.
     - mypy --junit-xml=junit-{envname}.xml --py2 --ignore-missing-imports lnt