diff --git a/requirements.txt b/requirements.txt
index c4de1e3edc475b556f1110f7d081a932c1ee028b..c68adb35ece2399d821369c2fc624bb0479bc18e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+future
 dynesty
 corner
 numpy
diff --git a/tests.py b/tests.py
index e686eb979c5d9116ce8c5455681f26401b967beb..b33785a1904a660ab9560ae1aecb5ce205dfa3af 100644
--- a/tests.py
+++ b/tests.py
@@ -4,6 +4,7 @@ import os
 import shutil
 import peyote
 import logging
+from past.builtins import execfile
 
 
 class Test(unittest.TestCase):