diff --git a/libs/langgraph/langgraph/types.py b/libs/langgraph/langgraph/types.py
index 26389ed37..104412d8e 100644
--- a/libs/langgraph/langgraph/types.py
+++ b/libs/langgraph/langgraph/types.py
@@ -114,7 +114,7 @@ class CachePolicy(NamedTuple):
 class Interrupt:
     value: Any
     resumable: bool = False
-    ns: Optional[str] = None
+    ns: Optional[Sequence[str]] = None
     when: Literal["during"] = "during"