diff --git a/dash/dash.py b/dash/dash.py
index fe0abe7085..350e37dad4 100644
--- a/dash/dash.py
+++ b/dash/dash.py
@@ -603,7 +603,7 @@ def _setup_server(self):
 
     def run_server(self,
                    port=8050,
-                   debug=True,
+                   debug=False,
                    threaded=True,
                    **flask_run_options):
         self.server.run(port=port, debug=debug, **flask_run_options)