diff --git a/src/conductor/client/workflow/task/http_poll_task.py b/src/conductor/client/workflow/task/http_poll_task.py
index f732595c..8964ba3b 100644
--- a/src/conductor/client/workflow/task/http_poll_task.py
+++ b/src/conductor/client/workflow/task/http_poll_task.py
@@ -48,7 +48,7 @@ def __init__(self,
                  polling_strategy: str = "FIXED",
                  method: HttpMethod = HttpMethod.GET,
                  uri: Optional[str] = None,
-                 headers: Optional[Dict[str, List[str]]] = None,
+                 headers: Optional[Dict[str, str]] = None,
                  accept: Optional[str] = None,
                  content_type: Optional[str] = None,
                  connection_time_out: Optional[int] = None,
diff --git a/src/conductor/client/workflow/task/http_task.py b/src/conductor/client/workflow/task/http_task.py
index be37e7ab..440639f1 100644
--- a/src/conductor/client/workflow/task/http_task.py
+++ b/src/conductor/client/workflow/task/http_task.py
@@ -44,7 +44,7 @@ class HttpInput:
     def __init__(self,
                  method: HttpMethod = HttpMethod.GET,
                  uri: Optional[str] = None,
-                 headers: Optional[Dict[str, List[str]]] = None,
+                 headers: Optional[Dict[str, str]] = None,
                  accept: Optional[str] = None,
                  content_type: Optional[str] = None,
                  connection_time_out: Optional[int] = None,