diff --git a/skyvern/schemas/runs.py b/skyvern/schemas/runs.py
index bf9ada7f..963fe79d 100644
--- a/skyvern/schemas/runs.py
+++ b/skyvern/schemas/runs.py
@@ -316,7 +316,7 @@ class WorkflowRunRequest(BaseModel):
     workflow_id: str = Field(
         description="ID of the workflow to run. Workflow ID starts with `wpid_`.", examples=["wpid_123"]
     )
-    parameters: dict[str, Any] = Field(default={}, description="Parameters to pass to the workflow")
+    parameters: dict[str, Any] | None = Field(default=None, description="Parameters to pass to the workflow")
     title: str | None = Field(default=None, description="The title for this workflow run")
     proxy_location: ProxyLocation | None = Field(
         default=ProxyLocation.RESIDENTIAL,