diff --git a/README.md b/README.md
index d525a95..bfed51f 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ from app.services import EmailClient
 
 @pytest.fixture
 def di_container() -> typing.Iterator[modern_di.Container]:
-    with modern_di.Container(groups=ioc.ALL_GROUPS) as container:
+    with modern_di.Container(groups=ioc.ALL_GROUPS, validate=True) as container:
         yield container
 
 
diff --git a/tests/conftest.py b/tests/conftest.py
index cf1a4ce..032d8c7 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -8,7 +8,7 @@
 
 @pytest.fixture
 def di_container() -> typing.Iterator[modern_di.Container]:
-    with modern_di.Container(groups=[Dependencies, ExtraDependencies]) as container:
+    with modern_di.Container(groups=[Dependencies, ExtraDependencies], validate=True) as container:
         yield container