diff --git a/scripts/seo_audit.py b/scripts/seo_audit.py
index f3ff6a2..d9921c9 100644
--- a/scripts/seo_audit.py
+++ b/scripts/seo_audit.py
@@ -433,12 +433,20 @@ class ContentFreshnessChecker:
                     except Exception:
                         continue
 
-            if latest_date and (result['last_content_update'] is None or latest_date > result['last_content_update']):
-                result['last_content_update'] = latest_date
+            if latest_date:
+                existing = result['last_content_update']
+                if existing is not None and existing.tzinfo is not None:
+                    existing = existing.replace(tzinfo=None)
+                if existing is None or latest_date > existing:
+                    result['last_content_update'] = latest_date
 
         # Calculate freshness score
         if result['last_content_update']:
-            days_old = (datetime.now() - result['last_content_update']).days
+            update_dt = result['last_content_update']
+            # Normalize: strip tzinfo if present so subtraction works with naive datetime.now()
+            if update_dt.tzinfo is not None:
+                update_dt = update_dt.replace(tzinfo=None)
+            days_old = (datetime.now() - update_dt).days
             if days_old <= 30:
                 result['content_freshness_score'] = 100
             elif days_old <= 90: