diff --git a/dataset.py b/dataset.py
index 2222196..f8778a6 100644
--- a/dataset.py
+++ b/dataset.py
@@ -1,6 +1,6 @@
 from dataclasses import dataclass, field
 from enum import Enum
-from typing import Any, Dict, List, Optional
+from typing import Any, Dict, List, Literal, Optional, Union
 import json, argparse, os, uuid
 from utils import prompt_yes_no
 
@@ -124,7 +124,7 @@ class Dataset:
         to_dump = Dataset(entries=entries_to_dump)
         print(f"{len(entries_to_dump)} entries...", end=" ", flush=True)
 
-        def transform_entry(entry: DatasetEntry | Dataset | Any) -> dict | list:
+        def transform_entry(entry: Union[DatasetEntry, Dataset, Any]) -> Union[dict, list]:
             if not isinstance(entry, (DatasetEntry, Dataset)):
                 return entry.__dict__
 
diff --git a/utils.py b/utils.py
index da841b5..6c5b4d6 100644
--- a/utils.py
+++ b/utils.py
@@ -1,5 +1,6 @@
 import os, sys, logging, subprocess
 from datetime import datetime
+from typing import Optional
 from github.Commit import Commit
 from github.PaginatedList import PaginatedList
 from github.PullRequestComment import PullRequestComment
@@ -166,7 +167,7 @@ def run_git_cmd(cmd: list[str], repo_path: str) -> subprocess.CompletedProcess:
     )
 
 
-def prompt_yes_no(prompt: str, *, default: bool | None = None) -> bool:
+def prompt_yes_no(prompt: str, *, default: Optional[bool] = None) -> bool:
     choices = "y/n"
     if default is not None:
         choices = "Y/n" if default else "y/N"