diff --git a/tox.ini b/tox.ini
index fbc60f2..5ad4b8d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,7 +42,9 @@ commands = black {posargs:--check} calibrestekje/ test/
 description = type check the source
 basepython = python3.7
 skipdist = True
-deps = mypy
+deps =
+  mypy
+  sqlalchemy_stubs
 commands = mypy calibrestekje/ test/
 
 [testenv:docs]