diff --git a/requirements.txt b/requirements.txt
index 3b74c3a874..71a7945549 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-eventlet>=0.25.0                        # MIT
+eventlet>=0.40.3                        # MIT
 greenlet>=0.3.2
 netifaces>=0.8,!=0.10.0,!=0.10.1
 PasteDeploy>=2.0.0