diff --git a/doc/requirements.txt b/doc/requirements.txt
index 42a22c93..88ca4411 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,4 +1,4 @@
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.0.0 # BSD
 openstackdocstheme>=2.2.1 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
 
@@ -8,7 +8,7 @@ python-consul2>=0.0.16 # MIT License
 ## etcd
 requests>=2.10.0 # Apache-2.0
 ## etcd3gw
-etcd3gw!=0.2.6,>=0.1.0 # Apache-2.0
+etcd3gw>=0.1.0 # Apache-2.0
 ## zake
 zake>=0.1.6 # Apache-2.0
 ## redis
@@ -20,6 +20,6 @@ PyMySQL>=0.6.2 # MIT License
 ## zookeeper
 kazoo>=2.2 # Apache-2.0
 ## memcached
-pymemcache!=1.3.0,>=1.2.9 # Apache 2.0 License
+pymemcache>=1.2.9 # Apache 2.0 License
 ## ipc
 sysv-ipc>=0.6.8 # BSD License
diff --git a/setup.cfg b/setup.cfg
index 9473d03f..6ff6c25b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -49,7 +49,7 @@ consul =
 etcd =
   requests>=2.10.0 # Apache-2.0
 etcd3gw =
-  etcd3gw!=0.2.6,>=2.3.0 # Apache-2.0
+  etcd3gw>=2.3.0 # Apache-2.0
 zake =
   zake>=0.1.6 # Apache-2.0
 redis =
@@ -62,6 +62,6 @@ mysql =
 zookeeper =
   kazoo>=2.6 # Apache-2.0
 memcached =
-  pymemcache!=1.3.0,>=1.2.9 # Apache 2.0 License
+  pymemcache>=1.2.9 # Apache 2.0 License
 ipc =
   sysv-ipc>=0.6.8 # BSD License