diff --git a/run.sh b/run.sh
index 3bafba1..427ab35 100755
--- a/run.sh
+++ b/run.sh
@@ -3,4 +3,4 @@
 cd "$(dirname "$0")"
 pipenv install
 export FLASK_APP=chat.py
-exec pipenv run gunicorn -w 1 -b0.0.0.0:5000 chat:app
+exec pipenv run gunicorn --worker-class eventlet -w 1 -b0.0.0.0:5000 chat:app