diff --git a/netkan/netkan/metadata.py b/netkan/netkan/metadata.py
index 1d0bf05..a64368c 100644
--- a/netkan/netkan/metadata.py
+++ b/netkan/netkan/metadata.py
@@ -315,6 +315,7 @@ def __str__(self) -> str:
         'application/x-tar': 'tar',
         'application/x-compressed-tar': 'tar.gz',
         'application/zip': 'zip',
+        'application/vnd.github+json': 'zip',
     }
     ISODATETIME_PROPERTIES = [
         'release_date'