diff --git a/Pipfile b/Pipfile
index 6b7192d..775a06d 100644
--- a/Pipfile
+++ b/Pipfile
@@ -23,6 +23,7 @@ raven = {extras = ["flask"], version = "*"}
 firebase-admin = "*"
 requests = "*"
 flask-restplus = "*"
+futures = "==3.1.1"
 
 
 [dev-packages]