diff --git a/bento_lib/types.py b/bento_lib/types.py
index fe5a12b..b86e1d9 100644
--- a/bento_lib/types.py
+++ b/bento_lib/types.py
@@ -1,4 +1,4 @@
-from typing import Literal, TypedDict, Union
+from typing import TypedDict
 
 __all__ = [
     "GA4GHServiceType",