diff --git a/mypy.ini b/mypy.ini
index 4ed651d..f6c48ee 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -1,5 +1,9 @@
 [mypy]
 python_version = 3.12
+strict = True
 
 [mypy-quartodoc.*]
 ignore_missing_imports = True
+
+[mypy-tests.*]
+disallow_untyped_defs = False