diff --git a/tap_github/authenticator.py b/tap_github/authenticator.py
index d873b77..9234786 100644
--- a/tap_github/authenticator.py
+++ b/tap_github/authenticator.py
@@ -227,7 +227,7 @@ def has_calls_remaining(self) -> bool:
                 self.claim_token()
                 if self.token is None:
                     if self.logger:
-                        self.logger.warn("GitHub app token refresh failed.")
+                        self.logger.warning("GitHub app token refresh failed.")
                     return False
                 else:
                     if self.logger:
@@ -278,7 +278,7 @@ def prepare_tokens(self) -> list[TokenManager]:
             if token_manager.is_valid_token():
                 personal_token_managers.append(token_manager)
             else:
-                logging.warn("A token was dismissed.")
+                logging.warning("A token was dismissed.")
 
         # Parse App level private keys and generate tokens
         # To simplify settings, we use a single env-key formatted as follows:
@@ -308,7 +308,7 @@ def prepare_tokens(self) -> list[TokenManager]:
                 if app_token_manager.is_valid_token():
                     app_token_managers.append(app_token_manager)
             except ValueError as e:
-                self.logger.warn(
+                self.logger.warning(
                     f"An error was thrown while preparing an app token: {e}"
                 )
 
diff --git a/tap_github/tests/test_authenticator.py b/tap_github/tests/test_authenticator.py
index 042e483..0ca38fd 100644
--- a/tap_github/tests/test_authenticator.py
+++ b/tap_github/tests/test_authenticator.py
@@ -1,6 +1,6 @@
 import re
 from datetime import datetime, timedelta
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock, call, patch
 
 import pytest
 import requests
@@ -215,10 +215,10 @@ def test_has_calls_remaining_logs_warning_if_token_regeneration_fails(self):
 
             mock_is_valid.return_value = False
             assert not token_manager.has_calls_remaining()
-            token_manager.logger.warn.assert_called_once()
-            assert (
-                "GitHub app token refresh failed."
-                in token_manager.logger.warn.call_args[0][0]
+            assert isinstance(token_manager.logger.warning, MagicMock)
+            token_manager.logger.warning.assert_has_calls(
+                [call("GitHub app token refresh failed.")],
+                any_order=True,
             )
 
     def test_has_calls_remaining_succeeds_if_token_new_and_never_used(self):
@@ -537,7 +537,7 @@ def test_handle_error_if_app_key_invalid(self, mock_stream):
             auth = GitHubTokenAuthenticator(stream=mock_stream)
             auth.prepare_tokens()
 
-            mock_stream.logger.warn.assert_called_with(
+            mock_stream.logger.warning.assert_called_with(
                 "An error was thrown while preparing an app token: Invalid key format"
             )