diff --git a/Dockerfile b/Dockerfile
index 0556359..9a36822 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,7 @@ RUN apt-get clean
 # install python dependencies
 RUN pip install --upgrade pip 
 RUN pip install -r requirements.txt
+RUN pip install gunicorn==20.1.0
 
 # collect static files
 # RUN python manage.py collectstatic --noinput