diff --git a/voluptuous/validators.py b/voluptuous/validators.py
index 89eed0f..cd00278 100644
--- a/voluptuous/validators.py
+++ b/voluptuous/validators.py
@@ -812,7 +812,7 @@ class In(object):
     """Validate that a value is in a collection."""
 
     def __init__(
-        self, container: typing.Iterable, msg: typing.Optional[str] = None
+        self, container: typing.Container, msg: typing.Optional[str] = None
     ) -> None:
         self.container = container
         self.msg = msg