diff --git a/gitmon/api.py b/gitmon/api.py
index 4fa6cc5..04e96aa 100644
--- a/gitmon/api.py
+++ b/gitmon/api.py
@@ -32,6 +32,10 @@ class GitHubApi:
             logging.warning(f'Failed to execute GET request: {str(e)}')
             return None
 
+        # 304 Not Modified
+        if response.status_code == '304':
+            return None
+
         self.__parse_headers(response.headers)
         return response.json()