diff --git a/requirements.txt b/requirements.txt
index d51dda473..af3e5e7ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ setuptools
 # Please keep it as the first item of this list.
 #
 pyserial>=3.0
-future>=0.16.0
+future>=0.15.2