diff --git a/utils.py b/utils.py
index 19e2d00..4a7798a 100644
--- a/utils.py
+++ b/utils.py
@@ -40,9 +40,9 @@ def is_valid_github_url(url):
         response = requests.get(url)
         if response.status_code != 200:
             return False
-        if response.headers.get('Server') != 'GitHub.com':
+        if response.headers.get('Server') != 'github.com':
             return False
         return True
     except:
         print("This is not a valid GitHub repository URL")
-        return False
\ No newline at end of file
+        return False