diff --git a/CHANGELOG b/CHANGELOG
index 32dbaf7..f078662 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,11 +1,12 @@
 # Changelog
 
-## Upcoming
+## Version 2.10.1
 
-(released on TBD)
+(released on 2025-02-18)
 
 - Update license dates.
 - Change `master` branch references to `main`.
+- Provisional Python 3.6 compatibility (Union syntax).
 
 ## Version 2.10.0
 
diff --git a/cli_helpers/utils.py b/cli_helpers/utils.py
index 921c2bc..5e6646f 100644
--- a/cli_helpers/utils.py
+++ b/cli_helpers/utils.py
@@ -5,7 +5,7 @@
 import os
 import re
 from functools import lru_cache
-from typing import Dict
+from typing import Dict, Union
 
 from typing import TYPE_CHECKING
 
@@ -119,7 +119,7 @@ def replace(s, replace):
 
 
 @lru_cache()
-def _get_formatter(style) -> Terminal256Formatter | TerminalTrueColorFormatter:
+def _get_formatter(style) -> Union[Terminal256Formatter, TerminalTrueColorFormatter]:
     if "truecolor" in os.getenv("COLORTERM", "").lower():
         return TerminalTrueColorFormatter(style=style)
     else: