diff --git a/mattermost_bot.py b/mattermost_bot.py
index 56588db..b67a629 100755
--- a/mattermost_bot.py
+++ b/mattermost_bot.py
@@ -10,7 +10,7 @@ from pytz import utc
 
 CHANNEL = os.environ["SUNBOT_ANNOUNCE_CHANNEL"]
 AUTHORIZATION = "Bearer " + os.environ["SUNBOT_ANNOUNCE_MATTERMOST_TOKEN"]
-URL = os.environ["SUNBOT_ANNOUNCE_MATTERMOST_API_ENDPOINT"] + "/posts"
+URL = os.environ["SUNBOT_ANNOUNCE_MATTERMOST_API_ENDPOINT"] + "/v4/posts"
 
 LOCATION = astral.LocationInfo("Gent", "Belgium", "Europe/Brussels", 51.05, 3.72)
 
@@ -24,7 +24,8 @@ def post(message):
 		"message": message
 	}
 	print("Posting " + str(payload), flush=True)
-	requests.post(URL, json=payload, headers={"Authorization": AUTHORIZATION})
+	r = requests.post(URL, json=payload, headers={"Authorization": AUTHORIZATION})
+	r.raise_for_status()
 
 
 def format_in(diff):