diff --git a/lib/galaxy/schema/schema.py b/lib/galaxy/schema/schema.py
index 941704544ac3..12ce32c7e722 100644
--- a/lib/galaxy/schema/schema.py
+++ b/lib/galaxy/schema/schema.py
@@ -1854,7 +1854,7 @@ class JobBaseModel(Model):
     )
     create_time: datetime = CreateTimeField
     update_time: datetime = UpdateTimeField
-    galaxy_version: str = Field(
+    galaxy_version: Optional[str] = Field(
         ...,
         title="Galaxy Version",
         description="The (major) version of Galaxy used to create this job.",