diff --git a/requirements.txt b/requirements.txt
index 94f8f84..3ca861b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,15 +4,15 @@
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 
-eventlet!=0.18.3,<0.21.0,>=0.18.2 # MIT
+eventlet!=0.18.3,!=0.20.1,<0.21.0,>=0.18.2 # MIT
 Flask!=0.11,<1.0,>=0.10 # BSD
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 oslo.cache>=1.5.0 # Apache-2.0
-oslo.config>=4.0.0 # Apache-2.0
+oslo.config!=4.3.0,!=4.4.0,>=4.0.0 # Apache-2.0
 oslo.messaging!=5.25.0,>=5.24.2 # Apache-2.0
 oslo.log>=3.22.0 # Apache-2.0
 oslo.db>=4.21.1 # Apache-2.0
-keystoneauth1>=2.20.0 # Apache-2.0
+keystoneauth1>=2.21.0 # Apache-2.0
 python-keystoneclient>=3.8.0 # Apache-2.0
-requests!=2.12.2,!=2.13.0,>=2.10.0 # Apache-2.0
+requests>=2.14.2 # Apache-2.0
 six>=1.9.0 # MIT