diff --git a/alembic/versions/009_remove_workspace_concept.py b/alembic/versions/009_remove_workspace_concept.py
index f47ab52e3..c490752c5 100644
--- a/alembic/versions/009_remove_workspace_concept.py
+++ b/alembic/versions/009_remove_workspace_concept.py
@@ -85,7 +85,7 @@ def upgrade() -> None:
     
     # Set shared_users to empty array for all projects
     conn.execute(text("""
-        UPDATE projects SET shared_users = []::json
+        UPDATE projects SET shared_users = '[]'::json
         WHERE shared_users IS NULL
     """))