diff --git a/requirements.txt b/requirements.txt
index aa4ccc8..3ad614f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,6 +17,7 @@ requests==2.18.4
 Unidecode==0.4.21
 PyJWT==1.5.3
 dicttoxml==1.7.4
+gunicorn==19.7.1
 
 # testing
 flake8==3.5.0