diff --git a/langgraph/checkpoint/base.py b/langgraph/checkpoint/base.py
index 125adca03..e63a00201 100644
--- a/langgraph/checkpoint/base.py
+++ b/langgraph/checkpoint/base.py
@@ -14,6 +14,7 @@ from langgraph.utils import StrEnum
 
 class Checkpoint(TypedDict):
     """State snapshot at a given point in time."""
+
     v: int
     """The version of the checkpoint format. Currently 1."""
     ts: str