diff --git a/CHANGELOG.md b/CHANGELOG.md
index 311b2b94f..4004bfd24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -88,6 +88,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- `RunnerArguments` now include the `body` field, so there's no need to add it
+  to subclasses. Also, all `RunnerArguments` fields are now keyword-only.
+
 - `CartesiaSTTService` now inherits from `WebsocketSTTService`.
 
 - Package upgrades:
diff --git a/src/pipecat/runner/types.py b/src/pipecat/runner/types.py
index 89aecd84c..fab2404f3 100644
--- a/src/pipecat/runner/types.py
+++ b/src/pipecat/runner/types.py
@@ -20,9 +20,11 @@ from fastapi import WebSocket
 class RunnerArguments:
     """Base class for runner session arguments."""
 
-    handle_sigint: bool = field(init=False)
-    handle_sigterm: bool = field(init=False)
-    pipeline_idle_timeout_secs: int = field(init=False)
+    # Use kw_only so subclasses don't need to worry about ordering.
+    handle_sigint: bool = field(init=False, kw_only=True)
+    handle_sigterm: bool = field(init=False, kw_only=True)
+    pipeline_idle_timeout_secs: int = field(init=False, kw_only=True)
+    body: Optional[Any] = field(default_factory=dict, kw_only=True)
 
     def __post_init__(self):
         self.handle_sigint = False
@@ -42,7 +44,6 @@ class DailyRunnerArguments(RunnerArguments):
 
     room_url: str
     token: Optional[str] = None
-    body: Optional[Any] = field(default_factory=dict)
 
 
 @dataclass
@@ -55,7 +56,6 @@ class WebSocketRunnerArguments(RunnerArguments):
     """
 
     websocket: WebSocket
-    body: Optional[Any] = field(default_factory=dict)
 
 
 @dataclass