diff --git a/locust/main.py b/locust/main.py
index c7747593de..c48d679c4c 100644
--- a/locust/main.py
+++ b/locust/main.py
@@ -309,6 +309,9 @@ def kill_workers(children):
 
     greenlet_exception_handler = greenlet_exception_logger(logger)
 
+    if sys.version_info < (3, 10):
+        logger.warning("Python 3.9 support is deprecated and will be removed soon")
+
     if options.stop_timeout:
         try:
             options.stop_timeout = parse_timespan(options.stop_timeout)