diff --git a/webhooks/webhook.py b/webhooks/webhook.py
index babdf3f..353a5f2 100755
--- a/webhooks/webhook.py
+++ b/webhooks/webhook.py
@@ -7,6 +7,7 @@ import argparse
 import hmac
 from functools import cache
 import tempfile
+import aiohttp
 import logging
 from pathlib import Path
 
@@ -68,13 +69,22 @@ async def github_post(request: Request) -> HTTPResponse:
         valid_pr_comment = (
             infos["action"] == "created" and infos["issue"]["state"] == "open"
             and "pull_request" in infos["issue"] )
+        pr_infos = await get_pr_infos(request)
 
         if valid_pr_comment:
-            return on_pr_comment(request)
+            return on_pr_comment(request, pr_infos)
 
     return response.json({"error": f"Unknown event '{event}'"}, 422)
 
 
+async def get_pr_infos(request: Request) -> dict:
+    pr_infos_url = request.json["issue"]["pull_request"]["url"]
+    async with aiohttp.ClientSession() as session:
+        async with session.get(pr_infos_url) as resp:
+            pr_infos = await resp.json()
+    return pr_infos
+
+
 def check_webhook_signatures(request: Request) -> Optional[HTTPResponse]:
     logging.warning("Unsafe webhook!")
     header_signature = request.headers.get("X-Hub-Signature")
@@ -131,22 +141,22 @@ def on_push(request: Request) -> HTTPResponse:
     return response.text("ok")
 
 
-def on_pr_comment(request: Request) -> HTTPResponse:
+def on_pr_comment(request: Request, pr_infos: dict) -> HTTPResponse:
     body = request.json["comment"]["body"].strip()[:100].lower()
 
     # Check the comment contains proper keyword trigger
     BUMP_REV_COMMANDS = ["!bump", "!new_revision", "!newrevision"]
     if any(trigger.lower() in body for trigger in BUMP_REV_COMMANDS):
-        bump_revision(request)
+        bump_revision(request, pr_infos)
         return response.text("ok")
 
     return response.empty()
 
 
-def bump_revision(request: Request) -> HTTPResponse:
+def bump_revision(request: Request, pr_infos: dict) -> HTTPResponse:
     data = request.json
     repository = data["repository"]["full_name"]
-    branch = data["ref"].split("/", 2)[2]
+    branch = pr_infos["head"]["ref"]
 
     logging.info(f"Will bump revision on {repository} branch {branch}...")
     with tempfile.TemporaryDirectory() as folder_str: