diff --git a/requirements.txt b/requirements.txt
index 5a3916192..4a0748db2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ os-client-config>=1.28.0 # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 requestsexceptions>=1.2.0 # Apache-2.0
 six>=1.9.0 # MIT
-futures>=3.0;python_version=='2.7' or python_version=='2.6' # BSD
+futures>=3.0.0;python_version=='2.7' or python_version=='2.6' # BSD
 iso8601>=0.1.11 # MIT
 
 keystoneauth1>=3.2.0 # Apache-2.0