diff --git a/src/holt59/aoc/__main__.py b/src/holt59/aoc/__main__.py
index cced3e6..c0bad6e 100644
--- a/src/holt59/aoc/__main__.py
+++ b/src/holt59/aoc/__main__.py
@@ -24,6 +24,7 @@ def dump_api_message(
         json.dumps(
             {"type": type, "time": datetime.now().isoformat(), "content": content}
         ),
+        flush=True,
         file=file,
     )