diff --git a/custom_components/openai_tts/config_flow.py b/custom_components/openai_tts/config_flow.py
index 8e58ccb..4ff750f 100644
--- a/custom_components/openai_tts/config_flow.py
+++ b/custom_components/openai_tts/config_flow.py
@@ -20,7 +20,7 @@ async def validate_api_key(api_key: str):
     """Validate the API key format."""
     if api_key is None:
         raise WrongAPIKey("API key is required")
-    if not (51 <= len(api_key) <= 56):
+    if not (51 <= len(api_key) <= 70):
         raise WrongAPIKey("Invalid API key length")
 
 async def validate_user_input(user_input: dict):