diff --git a/requirements.txt b/requirements.txt
index c179191d2e2..70ae0b03bea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -45,7 +45,7 @@ python-keystoneclient>=3.8.0 # Apache-2.0
 python-novaclient>=9.1.0 # Apache-2.0
 python-swiftclient>=3.2.0 # Apache-2.0
 pytz>=2013.6 # MIT
-requests>=2.14.2 # Apache-2.0
+requests>=2.14.2,!=2.20.0 # Apache-2.0
 retrying!=1.3.0,>=1.2.3 # Apache-2.0
 Routes>=2.3.1 # MIT
 taskflow>=2.16.0 # Apache-2.0