diff --git a/foodie_weekly_thread.py b/foodie_weekly_thread.py
index 1c36f3e..004456b 100644
--- a/foodie_weekly_thread.py
+++ b/foodie_weekly_thread.py
@@ -99,7 +99,7 @@ except Exception as e:
 
 def generate_intro_tweet(author):
     """Generate an intro tweet for the weekly thread."""
-    credentials = next((cred for cred in X_API_CREDENTIALS if cred["username"] == author["username"]), None)
+    credentials = X_API_CREDENTIALS.get(author["username"])
     if not credentials:
         logging.error(f"No X credentials found for {author['username']}")
         return None
@@ -145,7 +145,7 @@ def generate_intro_tweet(author):
 
 def generate_final_cta(author):
     """Generate a final CTA tweet for the weekly thread using GPT."""
-    credentials = next((cred for cred in X_API_CREDENTIALS if cred["username"] == author["username"]), None)
+    credentials = X_API_CREDENTIALS.get(author["username"])
     if not credentials:
         logging.error(f"No X credentials found for {author['username']}")
         return None