diff --git a/setup.py b/setup.py
index <HASH>..<HASH> 100644
--- a/setup.py
+++ b/setup.py
@@ -99,6 +99,7 @@ setup(name='allennlp',
           'awscli>=1.11.91',
           'flask==0.12.1',
           'flask-cors==3.0.3',
+          'gevent==1.2.2',
           'psycopg2',
           'argparse',
           'requests>=2.18',
add gevent to setup.py (#<I>)