diff --git a/run.py b/run.py
index f0bc95f..6ad7189 100644
--- a/run.py
+++ b/run.py
@@ -1036,7 +1036,7 @@ async def github(request):
     # which is not represented in the original webhook
     async def is_user_in_organization(user):
         token = open("./github_bot_token").read().strip()
-        async with aiohttp.ClientSession(headers={"Authorization": f"token {token}"}) as session:
+        async with aiohttp.ClientSession(headers={"Authorization": f"token {token}", "Accept": "application/vnd.github.v3+json"}) as session:
             await resp = session.get(f"https://api.github.com/orgs/YunoHost-Apps/members/{user}")
             return resp.status == 204