diff --git a/requirements.txt b/requirements.txt
index e567617..a18f532 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,6 @@
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
 six>=1.9.0 # MIT
 monotonic>=0.6 # Apache-2.0
-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
 contextlib2>=0.4.0 # PSF License
 PrettyTable<0.8,>=0.7.1 # BSD