diff --git a/setup.cfg b/setup.cfg
index f00e6f7..66f66ec 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -269,6 +269,21 @@ single_line_exclusions = typing
 [mypy]
 cache_dir = .cache/mypy
 
+# Check the interior of functions without type annotations.
+check_untyped_defs = true
+
+# Disallow generic types without explicit type parameters.
+disallow_any_generics = true
+
+# Disallow functions with incomplete type annotations.
+disallow_incomplete_defs = true
+
+# Disallow calling functions without type annotations.
+disallow_untyped_calls = true
+
+# Disallow functions without type annotations (or incomplete annotations).
+disallow_untyped_defs = true
+
 [mypy-folium.*]
 ignore_missing_imports = true
 [mypy-geopy.*]
diff --git a/src/urban_meal_delivery/console/decorators.py b/src/urban_meal_delivery/console/decorators.py
index ef416dd..74d3714 100644
--- a/src/urban_meal_delivery/console/decorators.py
+++ b/src/urban_meal_delivery/console/decorators.py
@@ -9,10 +9,12 @@ from typing import Any, Callable
 import click
 
 
-def db_revision(rev: str) -> Callable:  # pragma: no cover -> easy to check visually
+def db_revision(
+    rev: str,
+) -> Callable[..., Callable[..., Any]]:  # pragma: no cover -> easy to check visually
     """A decorator ensuring the database is at a given revision."""
 
-    def decorator(func: Callable) -> Callable:
+    def decorator(func: Callable[..., Any]) -> Callable[..., Any]:
         @functools.wraps(func)
         def ensure(*args: Any, **kwargs: Any) -> Any:  # noqa:WPS430
             """Do not execute the `func` if the revision does not match."""