diff --git a/doc/requirements.txt b/doc/requirements.txt
index 6020fc7..2c22fdd 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -5,4 +5,5 @@ pyserial
 sphinx-rtd-theme
 setuptools-scm
 appdirs
+future
 localconfig
diff --git a/setup.py b/setup.py
index ca1a774..23d6df9 100755
--- a/setup.py
+++ b/setup.py
@@ -73,6 +73,7 @@ setup(
         'pyserial',
         'six',
         'appdirs',
+        'future',
         'localconfig',
     ],
     setup_requires=[