diff --git a/submit50.py b/submit50.py
index b848e29..026cbd2 100644
--- a/submit50.py
+++ b/submit50.py
@@ -380,6 +380,11 @@ def progress_helper():
 def submit(org, problem):
     """Submit problem."""
 
+    # check announcements
+    res = requests.get("https://cs50.me/status/submit50")
+    if res.status_code == 200 and res.text.strip():
+        raise Error(res.text.strip())
+
     # require git 2.7+, so that credential-cache--daemon ignores SIGHUP
     # https://github.com/git/git/blob/v2.7.0/credential-cache--daemon.c
     if not which("git"):