diff --git a/libs/core/langchain_core/runnables/base.py b/libs/core/langchain_core/runnables/base.py
index edd9142d191..12fa390184b 100644
--- a/libs/core/langchain_core/runnables/base.py
+++ b/libs/core/langchain_core/runnables/base.py
@@ -5217,7 +5217,7 @@ class RunnableBindingBase(RunnableSerializable[Input, Output]):
     kwargs.
     """
 
-    config: RunnableConfig = Field(default_factory=RunnableConfig)
+    config: RunnableConfig = Field(default_factory=dict)  # type: ignore
     """The config to bind to the underlying Runnable."""
 
     config_factories: list[Callable[[RunnableConfig], RunnableConfig]] = Field(