diff --git a/snowflake_cybersyn_demo/workflows/human_input.py b/snowflake_cybersyn_demo/workflows/human_input.py
index 8fbcee9..ea3d1a3 100644
--- a/snowflake_cybersyn_demo/workflows/human_input.py
+++ b/snowflake_cybersyn_demo/workflows/human_input.py
@@ -1,15 +1,31 @@
-from typing import Callable
+from typing import Any, Awaitable, Protocol, runtime_checkable
 
 from llama_index.core.workflow import StartEvent, StopEvent, Workflow, step
 
 
+@runtime_checkable
+class HumanInputFn(Protocol):
+    """Protocol for getting human input."""
+
+    def __call__(self, prompt: str, **kwargs: Any) -> Awaitable[str]:
+        ...
+
+
+async def default_human_input_fn(prompt: str, **kwargs: Any) -> str:
+    return input(prompt)
+
+
 class HumanInputWorkflow(Workflow):
-    input: Callable = input
+    def __init__(
+        self, input: HumanInputFn = default_human_input_fn, **kwargs: Any
+    ):
+        super().__init__(**kwargs)
+        self.input = input
 
     @step
     async def human_input(self, ev: StartEvent) -> StopEvent:
         prompt = str(ev.get("prompt", ""))
-        human_input = self.input(prompt)
+        human_input = await self.input(prompt)
         return StopEvent(result=human_input)