diff --git a/requirements.txt b/requirements.txt
index 5a464b2d..b2aee6de 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,12 +4,13 @@
 pbr>=1.6 # Apache-2.0
 stevedore>=1.16.0 # Apache-2.0
 six>=1.9.0 # MIT
-enum34;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
+enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 voluptuous>=0.8.9 # BSD License
 msgpack>=0.4.0 # Apache-2.0
 fasteners>=0.7 # Apache-2.0
 tenacity>=3.2.1  # Apache-2.0
 futures>=3.0;python_version=='2.7' or python_version=='2.6' # BSD
-futurist!=0.15.0,>=0.11.0 # Apache-2.0
+futurist>=1.2.0 # Apache-2.0
 oslo.utils>=3.15.0 # Apache-2.0
 oslo.serialization>=1.10.0 # Apache-2.0
+grpcio>=1.0.0,<1.16.0