diff --git a/graphistry/compute/ast.py b/graphistry/compute/ast.py
index 38461899a6..93ad93ef40 100644
--- a/graphistry/compute/ast.py
+++ b/graphistry/compute/ast.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Optional, cast
+from typing_extensions import Literal
 import pandas as pd
 
 from graphistry.Plottable import Plottable