diff --git a/requirements.txt b/requirements.txt
index be2fdd5af6..7051195975 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ setuptools
 # Please keep it as the first item of this list.
 #
 pyserial>=3.0
-future>=0.16.0
+future>=0.15.2
 cryptography