diff --git a/lib/galaxy/schema/workflows.py b/lib/galaxy/schema/workflows.py
index 1bacb9c7c23d..00942261ea83 100644
--- a/lib/galaxy/schema/workflows.py
+++ b/lib/galaxy/schema/workflows.py
@@ -670,7 +670,7 @@ class WorkflowDictRunSummary(WorkflowDictBaseModel):
         # description="The encoded ID of the history associated with the workflow (or None if not applicable).",
         description="TODO",
     )
-    step_version_changes: Optional[List[Dict[str, Any]]] = Field(
+    step_version_changes: Optional[List[Union[str, Dict[str, Any]]]] = Field(
         None,
         title="Step Version Changes",
         description="Version changes for the workflow steps.",