diff --git a/doc/requirements.txt b/doc/requirements.txt
index fd5f86f..8c938c3 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -3,4 +3,5 @@ Pillow>=2.0
 qrcode>=4.0
 pyserial
 sphinx-rtd-theme
-setuptools-scm
\ No newline at end of file
+setuptools-scm
+future
diff --git a/setup.py b/setup.py
index d8b9f58..f4e706f 100755
--- a/setup.py
+++ b/setup.py
@@ -72,6 +72,7 @@ setup(
         'qrcode>=4.0',
         'pyserial',
         'six',
+        'future',
     ],
     setup_requires=[
         'setuptools_scm',