diff --git a/scripts/garmin_auth.py b/scripts/garmin_auth.py
index fd0fcf8..8a64ac5 100644
--- a/scripts/garmin_auth.py
+++ b/scripts/garmin_auth.py
@@ -10,6 +10,7 @@ Usage:
     python3 garmin_auth.py
 """
 import json
+from datetime import datetime
 from getpass import getpass
 
 try:
@@ -26,12 +27,13 @@ password = getpass("Garmin password: ")
 garth.login(email, password)
 
 tokens = {
-    "oauth1": garth.client.oauth1_token.serialize(),
-    "oauth2": garth.client.oauth2_token.serialize(),
-    "expires_at": garth.client.oauth2_token.expires_at.isoformat()
+    "oauth1": garth.client.oauth1_token.model_dump(),
+    "oauth2": garth.client.oauth2_token.model_dump(),
+    "expires_at": garth.client.oauth2_token.expires_at
 }
 
 print("\n--- Copy everything below this line ---")
 print(json.dumps(tokens, indent=2))
 print("--- Copy everything above this line ---")
-print(f"\nTokens expire: {tokens['expires_at']}")
+expires_dt = datetime.fromtimestamp(tokens['expires_at'])
+print(f"\nTokens expire: {expires_dt.isoformat()}")