diff --git a/c_chat_server/requirements.txt b/c_chat_server/requirements.txt
index 762c91d..9773949 100644
--- a/c_chat_server/requirements.txt
+++ b/c_chat_server/requirements.txt
@@ -35,6 +35,6 @@ pymongo==3.8.0
 pandas==0.24.2
 cryptography==2.7
 msgpack==0.6.1
-eventlet==0.25.0
+eventlet==0.31.0
 xpinyin