diff --git a/requirements.txt b/requirements.txt
index 5908a7b8bf..eb6fd5da1c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
-eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
+eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
 httplib2>=0.9.1 # MIT
 netaddr>=0.7.18 # BSD
 tenacity>=4.4.0 # Apache-2.0